Researcher Database
Last Updated :2024/11/15
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Degree
Profile and Settings
Name (Japanese)
YanagisawaName (Kana)
TatsuyaName
D-8278-2019, 200901066748675336
Alternate Names
Achievement
Research Interests
- Augmented Multipoles Quadrupolar Kondo Effect URu2Si2 United States: Germany: Czech Filled-Skutterudite Electron-Phonon Interaction Cage-Structured Compounds Rattling Internatonal Joint Research 局所電荷ゆらぎ Correlated Electron Systems Uranium-based Compounds Higher Multipoles Antiferromagnetism non BCS superconductivity 5f Electron Systems Heavy Fermion Systems Hidden Order アクチナイド 超伝導 Low Temperatures Ultrasound, Ultrasonic Measurements 強相関電子物性 Superconductibity Very Low Temperature Ultrasound Physics of Correlated Electrons
Research Areas
Research Experience
- 2022/07 - Today Hokkaido University Faculty of Science Professor
- 2012/01 - 2022/06 Hokkaido University Faculty of Science
- 2008/02 - 2011/12 Hokkaido University Creative Research Institution
- 2007/04 - 2008/01 Niigata University Graduate School of Science and Technology
- 2005 - 2007 University of California, San Diego
- 2004 - 2005 University of California, San Diego
- 2003 - 2004 Niigata University Graduate School of Science and Technology
Education
- - 2003 Niigata University Graduate School of Science and Technology
- - 2001 Niigata University Graduate School of Science and Technology
- - 1999 Niigata University Faculty of Science Department of Physics
Awards
- 2021/04 Toyora Physical and Chemical Research Institute Toyota Riken Scholar Program
Investigation of the multichannel Kondo effect using precision ultrasonic measurements受賞者: Tatsuya Yanagisawa - 2009/09 Northern Advancement Center for Science and Technollogy administrative director prize
1万気圧超の静水圧力下における高精度超音波測定技術の開発受賞者: YANAGISAWA Tatsuyahttps://www.noastec.jp/kinouindex/data2010/contents/04.html
Published Papers
- Tatsuya YanagisawaJPSJ News and Comments 21 2188-076X 2024/11/14 [Not refereed][Not invited]
- Michal Vališka, Tetiana Haidamak, Andrej Cabala, Jiří Pospíšil, Gaël Bastien, Vladimír Sechovský, Jan Prokleška, Tatsuya Yanagisawa, Petr Opletal, Hironori Sakai, Yoshinori Haga, Atsuhiko Miyata, Denis Gorbunov, Sergei ZherlitsynPhysical Review Materials 8 (9) 2024/09 [Refereed]
The first-order transition line in the H-T phase diagram of itinerant electron metamagnets terminates at the critical end point - analogous to the critical point on the gas-liquid condensation line in the p-T phase diagram. To unravel the impact of critical magnetic fluctuations on the crystal lattice of a metamagnet at the critical end point, we performed an ultrasonic study of the itinerant electron metamagnet UTe2 across varying temperatures and magnetic fields. At temperatures exceeding 9 K, a distinct V-shaped anomaly emerges, precisely centered at the critical field of the metamagnetic transition in the isothermal field dependence of elastic constants. This anomaly arises from lattice instability, triggered by critical magnetic fluctuations via strong magnetoelastic interactions. Remarkably, this effect is maximized precisely at the critical-end-point temperature. Comparative measurements of another itinerant metamagnet, UCoAl, reveal intriguing commonalities. Despite significant differences in the paramagnetic ground state, lattice symmetry, and the expected metamagnetic transition process between UTe2 and UCoAl, both exhibit similar anomalies in elastic properties near the critical end point. - Fusako Kon, Chihiro Tabata, Hiraku Saito, Taro Nakajima, Hiroyuki Hidaka, Tatsuya Yanagisawa, Hiroshi AmitsukaJournal of the Physical Society of Japan 93 (4) 0031-9015 2024/04/15 [Refereed]
- Ruo Hibino, Tatsuya Yanagisawa, Yoshito Mikami, Hiroyuki Hidaka, Hiroshi Amitsuka, Sergei Zherlitsyn, Joachim Wosnitza, Yu Yamane, Takahiro OnimaruJournal of the Physical Society of Japan 92 (7) 0031-9015 2023/07/15We measured the elastic constants (C11 − C12)=2 and C44 of the non-Kramers system Y0.63Pr0.37Ir2Zn20 (Pr-37% system) by means of ultrasound to check how the single-site quadrupolar Kondo effect is modified by increasing the Pr concentration. The Curie-like softening of (C11 − C12)=2 of the present Pr-37% system on cooling from 5 to 1 K can be reproduced by a multipolar susceptibility calculation based on the non-Kramers Γ3 doublet crystalline-electric-field ground state. Further, on cooling below 0.15 K, a temperature dependence proportional to pffiffiffi T was observed in (C11 − C12)=2. This behavior rather corresponds to the theoretical prediction of the quadrupolar Kondo “lattice” model, unlike that of the Pr-3.4% system, which shows a logarithmic temperature dependence based on the “single-site” quadrupolar Kondo theory. In addition, we discuss the possibility to form a vibronic state by the coupling between the low-energy phonons and the electric quadrupoles of the non-Kramers doublet in the Pr-37% system, since we found a low-energy ultrasonic dispersion in the temperature range between 0.15 and 1 K.
- Ruo Hibino, Tatsuya Yanagisawa, Yoshito Mikami, Hiroyuki Hidaka, Hiroshi Amitsuka, Sergei Zherlitsyn, Joachim Wosnitza, Yu Yamane, Takahiro OnimaruJPS Conf. Proc. 38 011089 2023/05/22 [Refereed]
- D. I. Gorbunov, R. Hibino, Y. Skourski, T. Yanagisawa, A. V. Andreev, S. Zherlitsyn, J. WosnitzaPhysical Review B 106 (14) 2469-9950 2022/10/01 [Refereed]
U3Cu4Ge4 is a uniaxial ferromagnet that displays a first-order magnetization process (FOMP) at 25 T for field applied along the hard b axis. Here, we report on ultrasound and magnetostriction measurements of U3Cu4Ge4 in static and pulsed magnetic fields up to 40 T. The FOMP causes stepwise anomalies in the magnetoelastic properties. U3Cu4Ge4 elongates along the a and c axes and shrinks along the b axis, leading to an almost zero volume effect. The sound velocities of the longitudinal and transverse acoustic waves decrease sharply at the FOMP, whereas the sound attenuation shows pronounced peaks. An analysis of the ultrasound data using a mean-field theory suggests the existence of quadrupolar interactions and crystal-electric-field effects. The 5f electronic states are between itinerant and localized, typical of uranium-based intermetallic compounds. - P. C. Ho, D. E. Maclaughlin, M. B. Maple, Lei Shu, A. D. Hillier, O. O. Bernal, T. Yanagisawa, P. K. Biswas, Jian Zhang, Cheng Tan, S. D. Hishida, T. McCullough-HunterPhysical Review B 106 (14) 2469-9950 2022/10/01 [Refereed]
The Pr-rich end 0≤x≤0.25 of the alloy series Pr1-xNdxOs4Sb12 has been studied using muon spin rotation and relaxation. The end compound PrOs4Sb12 is an unconventional heavy-fermion superconductor, which exhibits a spontaneous magnetic field associated with broken time-reversal symmetry (TRS) in the superconducting phase. No such field is observed in the Nd-doped alloys for x≥0.05, indicating that TRS has been restored. The superfluid density from the vortex-lattice field distribution is insensitive to Nd concentration for x 0.2, indicating that TRS restoration does not have a strong effect on the superconducting state. No Nd3+ static magnetism, ordered or disordered, is found down to the lowest temperatures of measurement. - Hiroyuki Hidaka, Shun Yanagiya, Eikai Hayasaka, Yuma Kaneko, Tatsuya Yanagisawa, Hiroshi Tanida, Hiroshi AmitsukaJournal of the Physical Society of Japan 91 (9) 0031-9015 2022/09/15 [Refereed]
The Ce-based metallic compound CeCoSi with a tetragonal structure exhibits successive phase transitions: a hidden ordering, whose order parameter is unidentified, at T0 ∼ 12 K and an antiferromagnetic ordering at TN = 9.4 K. [Tanida et al., J. Phys. Soc. Jpn. 88, 054716 (2019).] We performed specific heat, magnetoresistivity (MR), and magnetization (M) measurements for single crystals of CeCoSi at low temperatures in magnetic fields B of up to 14 T and constructed detailed magnetic field–temperature phase diagrams for both B k ½100] and [001]. In the longitudinal MR measurements for B k ½100], the sign of MR changes from negative in a paramagnetic state to positive in the hidden ordered state, which suggests a change in electronic state across T0. In addition, the longitudinal MR and magnetization processes for B k ½100] show anomalies upon the application of B in both ordered states, suggesting the presence of B-induced regions. Similar B-induced regions may exist in the magnetic phase diagram for B k ½001]. The emergence of B-induced regions may be attributed to a change in the symmetry of the order parameter or domain alignment on applying B. - Hiroyuki Hidaka, Yoshihiko Ihara, Tatsuya Yanagisawa, Hiroshi AmitsukaJournal of the Physical Society of Japan 90 (9) 093701 - 093701 0031-9015 2021/09/15 [Refereed]
9Be-NMR measurements were performed using single crystalline SmBe13 in order to investigate a magnetic structure of a low-temperature ordering state microscopically. We observed a spectral broadening in the ordered state, and the broadened spectral shape depends on the magnetic field directions. By comparing the experimentally obtained and simulated NMR spectra for magnetic fields along the cubic [001] and [011] directions, we argue a helical structure with a basal plane tilted from the (001) plane in low-field ordering region under the assumption of a helical with a propagation vector of (0, 0, 1/3) found in other RBe13 compounds (R = rare earths). Such a tilted helical structure is explained by a combination of an ellipse helical in the (001) plane and a longitudinal magnetic density wave along the [001] direction. Considering a magnetic easy axis parallel to [001] revealed by the magnetization measurements, the peculiar helical structure in SmBe13 may be built on delicate balance among exchange interactions, dipole-dipole interaction, and singleion magnetic anisotropy due to the crystalline electric field. - T. Yanagisawa, H. Matsumori, H. Saito, H. Hidaka, H. Amitsuka, S. Nakamura, S. Awaji, D. I. Gorbunov, S. Zherlitsyn, J. Wosnitza, K. Uhlířová, M. Vališka, V. SechovskýPhysical Review Letters 126 (15) 0031-9007 2021/04/12 [Refereed][Not invited]
We present acoustic signatures of the electric quadrupolar degrees of freedom in the honeycomb-layer compound UNi4B. The transverse ultrasonic mode C66 shows softening below 30 K both in the paramagnetic phase and antiferromagnetic phases down to ∼0.33 K. Furthermore, we traced magnetic field-temperature phase diagrams up to 30 T and observed a highly anisotropic elastic response within the honeycomb layer. These observations strongly suggest that Γ6(E2g) electric quadrupolar degrees of freedom in localized 5f2 (J=4) states are playing an important role in the magnetic toroidal dipole order and magnetic-field-induced phases of UNi4B, and evidence some of the U ions remain in the paramagnetic state even if the system undergoes magnetic toroidal ordering. - Hiroyuki Hidaka, Kota Mizuuchi, Eikai Hayasaka, Tatsuya Yanagisawa, Jun Ohara, Hiroshi AmitsukaPhysical Review B 102 (17) 2469-9950 2020/11/06 [Refereed]
The beryllide GdBe13 with the NaZn13-type face-centered-cubic structure has been known to undergo a proper helical-magnet ordering from experimental studies using polycrystalline samples. In the present study, we carried out electrical resistivity, specific heat, and magnetization measurements of single-crystalline GdBe13 in order to investigate a mechanism of its helical ordering. These measurements reveal that the present compound is a metallic system exhibiting the magnetic ordering of local Gd3+ moments at TN = 24.8 K accompanied with strong magnetic fluctuations extending to temperatures well above TN. Furthermore, we constructed a magnetic field-temperature (B-T) phase diagram for B [001]. It consists of a multidomain state, which is composed of magnetic structures with B applied parallel and perpendicular to the helical plane, in the lower-magnetic-field region below ∼0.45T and a possible single-domain conical one in the higher-field region in the ordering state. The helical structure of GdBe13 characterized by an incommensurate ordering vector q0 of (0, 0, 0.285) is discussed on the basis of a competition of Heisenberg exchange interactions between the Gd3+ moments assuming an one-dimensional layer crystal. The sequential change in the exchange interactions determined by a mean-field (MF) calculation can be essentially understood by the Ruderman-Kittel-Kasuya-Yosida interaction via anisotropic Fermi surfaces, whereas the orientation of the magnetic moments will be determined by the dipole-dipole interaction. On the other hand, the MF theory predicts a much smaller critical field Bc than the experimentally obtained one. To discuss the deviation of Bc from the MF calculation, we show a possibility of a fluctuation-induced first-order transition. - Hiroyuki Hidaka, Kota Mizuuchi, Tatsuya Yanagisawa, Hiroshi AmitsukaProceedings of the International Conference on Strongly Correlated Electron Systems (SCES2019) 2020/03/19 [Refereed]
- Shintaro Nakamura, Satoshi Awaji, Tatsuya Yanagisawa, Takeaki Saito, Takeshi Matsumura, Akira OchiaiProceedings of the International Conference on Strongly Correlated Electron Systems (SCES2019) 2020/03/19 [Refereed]
- Rare-Earth Atomic Motion in RBe13 (R: La, Pr, Sm)Satoshi Tsutsui, Yusei Shimizu, Hiroyuki Hidaka, Akinari Kohriki, Ryoya Murata, Yoshitaka Yoda, Tatsuya Yanagisawa, Hiroshi AmitsukaJPS Conf. Proc 30 011115-1 - 011115-6 2020/03/19 [Refereed][Not invited]
- Satoru Hamamoto and Yuina Kanai-Nakata and Hidenori Fujiwara and Kentaro Kuga and Takayuki Kiss and Atsushi Higashiya and Atsushi Yamasaki and Shin Imada and Arata Tanaka and Kenji Tamasaku and Makina Yabashi and Tetsuya Ishikawa and Hiroyuki Hidaka and Tatsuya Yanagisawa and Hiroshi Amitsuka and Akira SekiyamaJPS Conf. Proc.29 29 012010 2020/02 [Refereed][Not invited]
- Tatsuya Yanagisawa and Hiroyuki Hidaka and Hiroshi Amitsuka and Sergei Zherlitsyn and Joachim Wosnitza and Yu Yamane and Takahiro OnimaruJPS Conf. Proc. 29 015002 2020/02 [Refereed][Not invited]
- Yanagisawa, T., Hidaka, H., Amitsuka, H., Nakamura, S., Awaji, S., Green, E.L., Zherlitsyn, S., Wosnitza, J., Yazici, D., White, B.D., Maple, M.B.Philosophical Magazine 100 (10) 1 - 14 1478-6435 2020 [Refereed][Not invited]
In this study, ultrasonic measurements were performed on a single crystal of cubic PrNi$_2$Cd$_{20}$, down to a temperature of 0.02 K, to investigate the crystalline electric field ground state and search for possible phase transitions at low temperatures. The elastic constant $(C_{11}-C_{12})/2$, which is related to the $\Gamma_3$-symmetry quadrupolar response, exhibits the Curie-type softening at temperatures below $\sim$30 K, which indicates that the present system has a $\Gamma_3$ non-Kramers doublet ground state. A leveling-off of the elastic response appears below $\sim$0.1 K toward the lowest temperatures, which implies the presence of level splitting owing to a long-range order in a finite-volume fraction associated with $\Gamma_3$-symmetry multipoles. A magnetic field-temperature phase diagram of the present compound is constructed up to 28 T for $H \parallel$ [110]. A clear acoustic de Haas-van Alphen signal and a possible magnetic-field-induced phase transition at $H \sim$26 T are also detected by high-magnetic-field measurements. - Hamamoto, S., Kanai, Y., Fujioka, S., Nakatani, Y., Fujiwara, H., Kuga, K., Kiss, T., Higashiya, A., Yamasaki, A., Imada, S., Tanaka, A., Tamasaku, K., Yabashi, M., Ishikawa, T., Hidaka, H., Yanagisawa, T., Amitsuka, H., Matsumoto, K.T., Onimaru, T., Takabatake, T., Sekiyama, A.Journal of Electron Spectroscopy and Related Phenomena 238 0368-2048 2020 [Refereed][Not invited]
© 2019 Elsevier B.V. We report the core-level photoemission study of cubic PrBe13, PrIr2Zn20 and PrB6 using linearly polarized hard X-ray. We have successfully observed linear dichroism (LD) in Pr3+ 3d core-level photoemission spectra reflecting the 4f ground-state symmetry for all the compounds. The observed LDs and polarization-dependent spectra are reproduced by ionic-model calculations including the full multiplet theory and the local crystalline electric field (CEF) splitting. We have confirmed that LDs in Pr3+ 3d core-level photoemission spectra are able to determine unambiguously the Pr3+ 4f ground-state symmetry. - Hidaka, H., Mizuuchi, K., Yanagisawa, T., Amitsuka, H.Journal of the Physical Society of Japan 88 (3) 0031-9015 2019 [Refereed][Not invited]
Magnetic susceptibility, specific heat, and electrical resistivity measurements have been performed on single-crystal EuBe13 in the temperature range between 2 and 300 K to investigate its phonon property and the valence state of the Eu ion. The obtained temperature dependence of the magnetic susceptibility curves obey a typical Van Vleck susceptibility for Eu3+ with a nonmagnetic ground state in the entire measured temperature range. In the case of the specific heat, we observed the coexistence of Debye and Einstein phonon modes with characteristic Debye and Einstein temperatures of ~ 835 K and ~167 K, respectively, which are in good agreement with those previously reported for other isostructural MBe13 compounds (M = rare earths and actinides). The temperature dependence of the resistivity for EuBe13 shows an unusual T-cubed like dependence at low temperatures, as also observed for the nonmagnetic isostructural compound LaBe13, which can be reproduced well by calculations based on electron--phonon scattering using the estimated Debye temperature and Einstein temperature. We also summarized the relationship between the Eu-valence state and the free distance between the Eu ion and the first-nearest-neighbor atoms in several Eu-based cubic compounds, and argued that EuBe13 takes the Eu3+ state despite its larger free distance than other Eu3+ compounds. - Yanagisawa, T., Hidaka, H., Amitsuka, H., Zherlitsyn, S., Wosnitza, J., Yamane, Y., Onimaru, T.Physical Review Letters 123 (6) 0031-9007 2019 [Refereed][Not invited]
Ultrasonic investigations of the single-site quadrupolar Kondo effect in diluted Pr system Y$_{0.966}$Pr$_{0.034}$Ir$_2$Zn$_{20}$ are reported. The elastic constant $(C_{11}-C_{12})/2$ is measured down to ~40 mK using ultrasound for the dilute system Y$_{0.966}$Pr$_{0.034}$Ir$_2$Zn$_{20}$ and the pure compound YIr$_2$Zn$_{20}$. We found that the elastic constant $(C_{11}-C_{12})/2$ of the Pr-dilute system exhibits a logarithmic temperature dependence below $T_0$ ~0.3 K, where non-Fermi-liquid (NFL) behavior in the specific heat and electrical resistivity is observed. This logarithmic temperature variation manifested in the $\Gamma_3$-symmetry quadrupolar susceptibility is consistent with the theoretical prediction of the quadrupolar Kondo effect by D. L. Cox. On the other hand, the pure compound YIr$_2$Zn$_{20}$ without $4f$-electron contributions shows nearly no change in its elastic constants evidencing negligible phonon contributions. In addition, clear acoustic de Haas-van Alphen (dHvA) oscillations in the elastic constant were detected for both compounds on applying magnetic field. This is mainly interpreted as contribution from the Fermi surface of YIr$_2$Zn$_{20}$. - Tabata Chihiro, Ihara Yoshihiko, Shimmura Shogo, Miura Naoyuki, Hidaka Hiroyuki, Yanagisawa Tatsuya, Amitsuka HiroshiJOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 87 (11) 0031-9015 2018/11 [Refereed][Not invited]
The magnetically ordered phase of body-centered-tetragonal UAu2Si2 was explored through Si-29-NMR experiments on a magnetically oriented powder sample. The field-swept NMR spectra show asymmetric peak splitting in a magnetic field applied along the tetragonal [001] axis below the magnetic phase transition temperature, T-N = 20K. This splitting is well explained by the occurrence of a magnetic order with a propagation vector of k = (2/3, 0, 0) and magnetic moments pointing parallel to the [001] axis, providing collateral evidence for uncompensated (++-)-type antiferro-magnetic ordering with a spontaneous [001] magnetization component. - Klára Uhlířová, Naoyuki Miura, Vladimír Tkáč, Jan Prokleška, Maciej Chrobak, Zbigniew Tarnawski, Hiroyki Hidaka, Tatsuya Yanagisawa, Vladimír Sechovský, Hiroshi AmitsukaPhysica B: Condensed Matter 536 516 - 518 0921-4526 2018/05/01 [Refereed][Not invited]
Single crystals of ThBe13 and LuBe13 have been prepared using aluminum flux method. The crystals structure of both compounds was confirmed to be cubic of the NaZn13-type with the lattice parameters a = 10.183(6) Å and a = 10.395(3) Å for LuBe13 and ThBe13, respectively. The low temperature measurements of electrical resistance and ac susceptibility have revealed a BCS-type of superconductivity in ThBe13 below Tc = 125 mK. LuBe13 has been found to be superconducting below Tc = 630 mK. - Hidaka, H., Nagata, R., Tabata, C., Shimizu, Y., Miura, N., Yanagisawa, T., Amitsuka, H.Physical Review Materials 2 (5) 2475-9953 2018 [Refereed][Not invited]
The beryllides MBe13 (M = rare earths and actinides) crystallize in a NaZn13-type cubic structure, which can be categorized as a cage-structured compound. In this study, powder X-ray diffraction measurements have been performed on LaBe13, SmBe13, and UBe13 in the temperature range between 7 and 300 K in order to investigate their crystallographic characteristics systematically. They keep the NaZn13-type cubic structure down to the lowest temperature. We estimated their Debye temperature to be 600 - 750 K from analyses of the temperature dependence of a lattice parameter, being in good agreement with the values reported previously. Rietveld refinements on the obtained powder patterns revealed that the M atom in the 8a site is located in an almost ideal snub cube formed by 24 Be atoms in the 96i site, whose caged structure is unchanged even at the low temperatures. In addition, it is argued from the temperature variation of an isotropic mean-square displacement parameter that the MBe13 compounds commonly have a low-energy phonon mode, which can be described by a model assuming an Einstein oscillation of the M atom with a characteristic temperature of ~ 160 K. - Saito, H., Uenishi, K., Miura, N., Tabata, C., Hidaka, H., Yanagisawa, T., Amitsuka, H.Journal of the Physical Society of Japan 87 (3) 33702 0031-9015 2018 [Refereed][Not invited]
Magnetization measurements under direct electric currents were performed for toroidal magnetic ordered state of UNi$_4$B to test a recent theoretical prediction of current-induced magnetization in a metallic system lacking local inversion symmetry.We found that each of the electric currents parallel to [$2\bar{1}\bar{1}0$] and [$0001$] in the hexagonal 4-index notation induces uniform magnetization in the direction of [$01\bar{1}0$].The observed behavior of the induced magnetization is essentially consistent with the theoretical prediction; however it also shows an inconsistency suggesting that the antiferromagnetic state of UNi$_4$B could not simply be regarded as a uniform toroidal order in the ideal honeycomb layered structure. - Yanagisawa, T., Mombetsu, S., Hidaka, H., Amitsuka, H., Cong, P.T., Yasin, S., Zherlitsyn, S., Wosnitza, J., Huang, K., Kanchanavatee, N., Janoschek, M., Maple, M.B., Aoki, D.Physical Review B 97 (15) 2469-9969 2018 [Refereed][Not invited]
The elastic properties of URu2Si2 in the high magnetic field region above 40 T, over a wide temperature range from 1.5 to 120 K, were systematically investigated by means of high-frequency ultrasonic measurements. The investigation was performed at high magnetic fields to better investigate the innate bare 5f-electron properties, since the unidentified electronic thermodynamic phase of unknown origin, the so-called "hidden order" (HO), and associated hybridization of conduction and f electrons (c-f hybridization) are suppressed at high magnetic fields. From the three different transverse modes we find contrasting results both the Γ4(B2g) and Γ5(Eg) symmetry modes C66 and C44 show elastic softening that is enhanced above 30 T, while the characteristic softening of the Γ3(B1g) symmetry mode (C11-C12)/2 is suppressed in high magnetic fields. These results underscore the presence of a hybridization-driven Γ3(B1g) lattice instability in URu2Si2. However, the results from this work cannot be explained by using existing crystalline electric field schemes applied to the quadrupolar susceptibility in a local 5f2 configuration. Instead, we present an analysis based on a band Jahn-Teller effect. - Vališka, M., Saito, H., Yanagisawa, T., Tabata, C., Amitsuka, H., Uhlířová, K., Prokleška, J., Proschek, P., Valenta, J., Míšek, M., Gorbunov, D.I., Wosnitza, J., Sechovský, V.Physical Review B 98 (17) 2469-9950 2018 [Refereed][Not invited]
© 2018 American Physical Society. Thermal expansion, magnetostriction, and magnetization measurements under magnetic field and hydrostatic pressure were performed on a UAu2Si2 single crystal. They revealed a large anisotropy of magnetoelastic properties manifested by prominent length changes, leading to a collapse of the unit-cell volume accompanied by breaking the fourfold symmetry (similar to that in URu2Si2 in the hidden-order state) in the antiferromagnetic state as consequences of strong magnetoelastic coupling. The magnetostriction curves measured at higher temperatures confirm a bulk character of the 50K weak ferromagnetic phase. The large positive pressure change of the ordering temperature predicted from Ehrenfest relation contradicts the more than an order of magnitude smaller pressure dependence observed by the magnetization and specific heat measured under hydrostatic pressure. A comprehensive magnetic phase diagram of UAu2Si2 in magnetic field applied along the c axis is presented. The ground-state antiferromagnetic phase is suppressed by a field-induced metamagnetic transition that changes its character from second to first order at the tricritical point. - Satoshi Tsutsui, Yoshio Kobayashi, Jin Nakamura, Michael K. Kubo, Shota Amagasa, Yasuhiro Yamada, Yoshitaka Yoda, Yusei Shimizu, Hiroyuki Hidaka, Tatsuya Yanagisawa, Hiroshi Amitsuka, Akira Yamada, Ryuji Higashinaka, Tatsuma D. Matsuda, Yuji AokiHYPERFINE INTERACTIONS 238 0304-3843 2017/11 [Refereed][Not invited]
Synchrotron-Radiation-based Sm-149 Mossbauer spectroscopy was applied to Sm intermetallics, SmBe13 and SmTi2Al20. Temperature dependence of the Mossbauer parameters in SmBe13 indicate the Sm valence state is purely trivalent. SmBe13 also showed second-order Doppler shift in synchrotron-radiation-based Sm-149 Mossbauer spectroscopy. The Mossbauer parameters obtained in SmTi2Al20 suggest that the Sm valence is fluctuating and the magnitude of the magnetic moment is reduced by hybridization between 4f and conduction electrons and/or effect of crystal electric field. - Hiroyuki Hidaka, Seigo Yamazaki, Yusei Shimizu, Naoyuki Miura, Chihiro Tabata, Tatsuya Yanagisawa, Hiroshi AmitsukaJOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 86 (7) 0031-9015 2017/06/13 [Refereed][Not invited]
The physical properties of single-crystalline SmBe$_{13}$ with a NaZn$_{13}$-type cubic structure have been studied by electrical resistivity ($\rho$), specific heat ($C$), and magnetization ($M$) measurements in magnetic fields of up to 9 T. The temperature ($T$) dependence of $\rho$ shows normal metallic behavior without showing the Kondo -ln$T$ behavior, suggesting the weak hybridization effect in this system. Analyses of the temperature dependence of $C$ suggest that the Sm ions of this compound are trivalent and that the crystalline-electric-field (CEF) ground state is a $\Gamma_8$ quartet with a first-excited state of a $\Gamma_7$ doublet located at the energy scale of $\sim$ 90 K. Mean-field calculations based on the suggested CEF level scheme can reasonably well reproduce the $T$ dependence of magnetic susceptibility ($\chi$) below $\sim$ 70 K. These results in the paramagnetic state strongly indicate that the 4$f$ electrons are well localized with the Sm$^{3+}$ configuration. At low temperatures, the 4$f$ electrons undergo a magnetic order at $T_{\rm M}$ $\sim$ 8.3 K, where $\chi$($T$) shows an antiferromagnetic-like cusp anomaly. From the positive Curie--Weiss temperature obtained from the mean-field calculations and from a constructed magnetic phase diagram with multiple regions, we discussed the magnetic structure of SmBe$_{13}$ below $T_{\rm M}$, by comparing with other isostructural MBe$_{13}$ compounds showing helical-magnetic ordering. - Hiroyuki Hidaka, Yusei Shimizu, Seigo Yamazaki, Naoyuki Miura, Ryoma Nagata, Chihiro Tabata, Shota Mombetsu, Tatsuya Yanagisawa, Hiroshi AmitsukaJournal of the Physical Society of Japan 86 (2) 0031-9015 2017/01/17 [Refereed][Not invited]
The thermal and electrical transport properties of single-crystalline LaBe$_{13}$ have been investigated by specific-heat ($C$) and electrical-resistivity ($\rho$) measurements. The specific-heat measurements in a wide temperature range revealed the presence of a hump anomaly near 40 K in the $C$($T$)/$T$ curve, indicating that LaBe$_{13}$ has a low-energy Einstein-like-phonon mode with a characteristic temperature of $\sim$ 177 K. In addition, a superconducting transition was observed in the $\rho$ measurements at the transition temperature of 0.53 K, which is higher than the value of 0.27 K reported previously by Bonville et al. Furthermore, an unusual $T^3$ dependence was found in $\rho$($T$) below $\sim$ 50 K, in contrast to the behavior expected from the electron--electron scattering or the electron--Debye phonon scattering. - Pei Chun Ho, John Singleton, Paul A. Goddard, Fedor F. Balakirev, Shalinee Chikara, Tatsuya Yanagisawa, M. Brian Maple, David B. Shrekenhamer, Xia Lee, Avraham T. ThomasPhysical Review B 94 (20) 2469-9950 2016/11/01 [Refereed][Not invited]
MHz conductivity, torque magnetometer and magnetization measurements are reported on single crystals of CeOs$_4$Sb$_{12}$ and NdOs$_4$Sb$_{12}$ using temperatures down to 0.5~K and magnetic fields of up to 60~tesla. The field-orientation dependence of the de Haas-van Alphen and Shubnikov-de Haas oscillations is deduced by rotating the samples about the $[010]$ and $[0\bar{1}1]$ directions. The results indicate that NdOs$_4$Sb$_{12}$ has a similar Fermi surface topology to that of the unusual superconductor PrOs$_4$Sb$_{12}$, but with significantly smaller effective masses, supporting the importance of local phonon modes in contributing to the low-temperature heat capacity of NdOs$_4$Sb$_{12}$. By contrast, CeOs$_4$Sb$_{12}$ undergoes a field-induced transition from an unusual semimetal into a high-field, high-temperature state characterized by a single, almost spherical Fermi-surface section. The behavior of the phase boundary and comparisons with models of the bandstructure lead us to propose that the field-induced phase transition in CeOs$_4$Sb$_{12}$ is similar in origin to the well-known $\alpha-\gamma$ transition in Ce and its alloys. - Chihiro Tabata, Naoyuki Miura, Klára Uhlířová, Michal Vališka, Hiraku Saito, Hiroyuki Hidaka, Tatsuya Yanagisawa, Vladimír Sechovský, Hiroshi AmitsukaPhysical Review B 94 (21) 2469-9950 2016/08/22 [Refereed][Not invited]
Single-crystalline UAu$_2$Si$_2$ has been grown by a floating-zone melting method, and its magnetic, thermal and transport properties have been investigated through measurements of magnetization, specific heat and electrical resistivity to reveal its peculiar magnetism. It is shown that UAu$_2$Si$_2$ undergoes a second-order phase transition at \tm = 19 K, which had been believed to be ferromagnetic ordering in the literature, from a paramagnetic phase to an uncompensated antiferromagnetic phase with spontaneous magnetization along the tetragonal $c$-axis (the easy magnetization direction). The magnetic entropy analysis points to the itinerant character of 5f electrons in the magnetic ordered state of UAu$_2$Si$_2$ with large enhancement of the electronic specific heat coefficient of $\gamma$ $\sim$ 150 mJ/K$^2$mol at 2 K. It also reveals the relatively isotropic crystalline electric field effect of this compound, with contrast to the other relative isostructural compounds. The observed magnetization curves strongly suggest that there is a parasitic ferromagnetic component developing below $\sim$ 50 K in high coercivity with the easy axis along the tetragonal $c$-axis. The results are discussed in the context of evolution of magnetism within the entire family of isostructural U$T_2$Si$_2$ compounds. - Satoshi Tsutsui, Ryo Masuda, Yasuhiro Kobayashi, Yoshitaka Yoda, Kota Mizuuchi, Yusei Shimizu, Hiroyuki Hidaka, Tatsuya Yanagisawa, Hiroshi Amitsuka, Fumitoshi Iga, Makoto SetoJOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 85 (8) 0031-9015 2016/08 [Refereed][Not invited]
Synchrotron radiation Sm-149 Mossbauer spectroscopy in the energy domain has successfully been carried out on Sm2O3, SmBe13, and SmB6. The isomer shift values were determined in these compounds to discuss their Sm valence state. We also investigated the time window effect on spectra, which is useful for measuring spectra with "high-energy-resolution". This effect makes it possible to discuss the frequency of valence fluctuation in Sm compounds as well as determine Sm valence state precisely using the Sm-149 Mossbauer effect. We discussed the fluctuation of the Sm valence in SmB6. - S. Mombetsu, T. Murazumi, H. Hidaka, T. Yanagisawa, H. Amitsuka, P. -C. Ho, M. B. MaplePHYSICAL REVIEW B 94 (8) 2469-9950 2016/08 [Refereed][Not invited]
We present high-frequency ultrasonic measurements on the filled skutterudite SmOs4Sb12 under hydrostatic pressure. The results clarify that the 4f electrons in this compound transform from delocalized at ambient pressure to localized at high pressures with a crossover pressure of approximately 0.7 GPa. This drastic change in the 4f electrons under pressure is apparently related to the non-Fermi-liquid state, which appears in an intermediate-pressure range of 0.5-1.5 GPa. The results of our analysis strongly suggest that the ferro-octupolar interaction becomes dominant at high pressure. Moreover, we report the pressure dependence of the ultrasonic dispersion, which is due to rattling, over a wide range of ultrasonic frequencies up to 323 MHz. The drastic change in the ultrasonic dispersions and the frequency-dependent elastic anomaly in the C-11 mode at lower temperatures imply a possible coupling between rattling phonons and 4f electrons. - Shota Mombetsu, Tatsuya Yanagisawa, Hiroyuki Hidaka, Hiroshi Amitsuka, Shadi Yasin, Sergei Zherlitsyn, Jochen Wosnitza, Pei-Chun Ho, M. Brian MapleJournal of the Physical Society of Japan 85 (4) 0031-9015 2016/03/30 [Refereed][Not invited]
Our ultrasound results obtained in pulsed magnetic fields show that the filled-skutterudite compound SmOs$_4$Sb$_{12}$ has the $\Gamma_{67}$ quartet crystalline-electric-field ground state. This fact suggests that the multipolar degrees of freedom of the $\Gamma_{67}$ quartet play an important role in the unusual physical properties of this material. On the other hand, the elastic response below $\approx$ 20 T cannot be explained using the localized 4$f$-electron model, which does not take into account the Kondo effect or ferromagnetic ordering. The analysis result suggests the presence of a Kondo-like screened state at low magnetic fields and its suppression at high magnetic fields above 20 T even at low temperatures. - Yusei Shimizu, Yoshinori Haga, Tatsuya Yanagisawa, Hiroshi AmitsukaPhysical Review B 93 (2) 2469-9969 2016/01/06 [Refereed][Not invited]
Static dc magnetization M(H) measurements were performed for a single crystal of UBe13 down to 0.1 K in magnetic fields up to 80 kOe for H(100) and H(110). For both field directions, an unusual magnetic anomaly was observed at HMag∗∼20-30 kOe in the superconducting mixed state. This anomaly was seen in the thermal-equilibrium-magnetization curves as well as the increasing- and decreasing-field processes of the raw magnetization curves, implying a change of the thermodynamic property at HMag∗. Furthermore, the magnetic anisotropy of the superconducting diamagnetic response is found to be significant above HMag∗, possibly associated with the anisotropy of the upper critical field Hc2. Considering the suppression of reduced upper critical field h∗ and the dramatic decrease of Maki parameter κ2 around 0.9Tc, the paramagnetic effect is present in UBe13. The paramagnetic effect in UBe13 could become anisotropic at low temperature below ∼Tc/2. An alternative explanation of the magnetic anisotropy is however that the anisotropy of the nonlinear susceptibility for the heavy electrons in the vortex cores becomes significant below ∼Tc/2. - Yusei Shimizu, Yoshinori Haga, Tatsuya Yanagisawa, Hiroshi AmitsukaPHYSICAL REVIEW B 93 (2) 1098-0121 2016/01 [Refereed][Not invited]
Static dc magnetization M(H) measurements were performed for a single crystal of UBe13 down to 0.1 K in magnetic fields up to 80 kOe for H parallel to < 100 > and H parallel to < 100 >. For both field directions, an unusual magnetic anomaly was observed at H-Mag* similar to 20-30 kOe in the superconducting mixed state. This anomaly was seen in the thermal-equilibrium-magnetization curves as well as the increasing-and decreasing-field processes of the raw magnetization curves, implying a change of the thermodynamic property at H-Mag*. Furthermore, the magnetic anisotropy of the superconducting diamagnetic response is found to be significant above H-Mag*, possibly associated with the anisotropy of the upper critical field H-c2. Considering the suppression of reduced upper critical field h* and the dramatic decrease of Maki parameter kappa(2) around 0.9T(c), the paramagnetic effect is present in UBe13. The paramagnetic effect in UBe13 could become anisotropic at low temperature below similar to T-c/2. An alternative explanation of the magnetic anisotropy is however that the anisotropy of the nonlinear susceptibility for the heavy electrons in the vortex cores becomes significant below similar to T-c/2. - S. Mombetsu, T. Murazumi, K. Hiura, S. Yamazaki, Y. Shimizu, H. Hidaka, T. Yanagisawa, H. Amitsuka, S. Yasin, S. Zherlitsyn, J. WosnitzaTMU INTERNATIONAL SYMPOSIUM ON NEW QUANTUM PHASES EMERGING FROM NOVEL CRYSTAL STRUCTURE 683 1742-6588 2016 [Refereed][Not invited]
Ultrasonic measurements were performed on the cage-structure compound SmBe13. We have investigated the magnetic field temperature phase diagram of this material by using pulsed magnetic fields. We found that the low-temperature magnetic order is suppressed by a magnetic field of 43 T for H parallel to [001], which is smaller than the estimated value from mean-field approximation assuming the Gamma(8) quartet crystal-electric-field ground state and simple antiferromagnetic order. We found that the elastic constant C-44 shows softening below the ordering temperature and has a local minimum below 7 T. These facts suggest that the low temperature state is not a simple antiferromagnetically ordered state. In addition, no elastic anomaly due to rattling modes was found in the present measurements. - Hiroyuki Hidaka, Shinya Otani, Hiraku Saito, Kaori Tatsumi, Tatsuya Yanagisawa, Hiroshi AmitsukaJOURNAL OF MAGNETISM AND MAGNETIC MATERIALS 385 428 - 432 0304-8853 2015/07 [Refereed][Not invited]
We have performed electrical-resistivity measurements under hydrostatic pressures ranging up to 4.47 GPa on the cubic compound CeAg. A pressure-temperature phase diagram has been revised in a high-pressure range above similar to 2.1 GPa, where the system is known to enter into an unidentified phase through a first-order phase transition. We have found that the electrical resistivity shows a clear kink anomaly below similar to 4 K in this unknown phase. The anomaly shifts to lower temperature with increasing pressure, and shows a tendency to reach absolute zero at similar to 6 GPa, suggesting the presence of a pressure induced quantum critical point around this pressure. We have also observed that a first order phase boundary line, which separates the phase diagram into two regions of a tetragonal phase and the unidentified phase, seems to terminate in a critical end point located at (P-CEP, T-CEP) similar to(3.2 GPa, 200 K). This suggests that the crystal symmetry of the unidentified phase above similar to 2.1 GPa is also tetragonal. (C) 2015 Elsevier B.V. All rights reserved - D. Yazici, T. Yanagisawa, B. D. White, M. B. MaplePHYSICAL REVIEW B 91 (11) 115136.1-115136.7 1098-0121 2015/03 [Refereed][Not invited]
Temperature-dependent magnetization, specific-heat, and electrical-resistivity measurements were performed on single crystals of PrNi2Cd20 and PrPd2Cd20. Neither compound shows any evidence for magnetic order above 2 K. Magnetization measurements suggest that Pr ions assume a nonmagnetic Gamma(1) singlet or non-Kramers Gamma(3) doublet ground state. A broad peak, which is identified as a Schottky anomaly, is observed in the specific heat at low temperature. Low-lying excitations involving the 4f electrons persist down to 2 K for both PrNi2Cd20 and PrPd2Cd20 and related features are also observed in the magnetization and electrical resistivity. - Tatsuya Yanagisawa, Kenta Hiura, Shota Mombetsu, Taro Murazumi, Hiroyuki Hidaka, Hiroshi Amitsuka, Naoyuki Tateiwa, Yoshinori HagaINTERNATIONAL CONFERENCE ON STRONGLY CORRELATED ELECTRON SYSTEMS 2014 (SCES2014) 592 1742-6588 2015 [Refereed][Not invited]
The elastic properties of localized 5f-electron system U3Pd20Si6 were studied by means of ultrasonic measurements under magnetic fields. We have measured elastic constants C-11, (C-11-C-12)/2, C-44 and C-L110 = C-B + (C-11-C-12)/6 + C-44 in order to check a possible contribution of electric quadrupoles on the magnetically ordered phases of this compound for Gamma(1) Gamma(3), Gamma(5) and Fi e F3 e F5 symmetries elastic response, respectively. We discovered that an elastic anomaly, which is accompanied by ultrasonic attenuation maximum of F5symmetry mode, at around T* similar to 16 K in zero magnetic field and shifts to lower temperatures with increasing magnetic fields. Since the T* seems to be continuously connected to the lower boundary of a 'spin-flop' region in the magnetic field-temperature phase diagram of U3Pd20Si6, we conclude that a fluctuation of the spin-system of the 8c-site ion exists even just below TN and couples to elastic wave via magneto-elastic coupling with F5-symmetry quadrupoles of U's 5f electron or local charge distributions of the guest U ion. - C. Tabata, T. Inami, S. Michimura, M. Yokoyama, H. Hidaka, T. Yanagisawa, H. AmitsukaPHILOSOPHICAL MAGAZINE 94 (32-33) 3691 - 3701 1478-6435 2014/11 [Refereed][Not invited]
We performed synchrotron X-ray diffraction measurements on a small single crystal of [GRAPHICS] with approximate dimensions of [GRAPHICS] . A backscattering diffraction set-up (2 [GRAPHICS] ) in combination with a Si(660) monochromator ensures a high instrumental resolution of [GRAPHICS] , where [GRAPHICS] denotes a lattice-plane spacing and [GRAPHICS] is its spread expressed as the full width at half maximum (FWHM). We carefully measured the (550) Bragg peak in the temperature range between 5 and 25K, and found it to show no signature of broadening and splitting when "Hidden Order (HO)" sets in below 17.5K. Temperature variation of the peak position closely follows the behaviour of the known linear thermal expansion coefficient. Detailed analysis of the peak width reveals that the tetragonal fourfold rotational symmetry of [GRAPHICS] is conserved in HO within the experimental accuracy of the orthorhombicity of [GRAPHICS] . We also found that the (550) peak profile exhibits a temperature-independent fine structure, which indicates that the tetragonal [GRAPHICS] -axis lattice parameter of the used crystal is distributed with a FWHM of [GRAPHICS] . - Tatsuya YanagisawaPhilosophical Magazine 94 (32-33) 3775 - 3788 1478-6435 2014/11 [Refereed][Not invited]
This paper reports recent progress of ultrasonic measurements on URu$_2$Si$_2$, including ultrasonic measurements under hydrostatic pressure, in pulsed-magnetic fields, and the effect of Rh-substitution. The observed changes of the elastic responses shed light on the orthorhombic-lattice instability with $\Gamma_3$-symmetry existing within the hidden order and the hybridized 5$f$-electron states of URu$_2$Si$_2$. - P. -C. Ho, D. E. MacLaughlin, Lei Shu, O. O. Bernal, Songrui Zhao, A. A. Dooraghi, T. Yanagisawa, M. B. Maple, R. H. FukudaPHYSICAL REVIEW B 89 (23) 235111.1-235111.7 1098-0121 2014/06 [Refereed][Not invited]
Positive-muon (mu(+)) Knight shifts have been measured in the paramagnetic states of Pr1-xNdxOs4Sb12 alloys, where x = 0, 0.25, 0.45, 0.50, 0.55, 0.75, and 1.00. In Pr-substituted NdOs4Sb12 (x 0.75), but not in NdOs4Sb12, Clogston-Jaccarino plots of mu(+) Knight shift K versus magnetic susceptibility. exhibit an anomalous saturation of K(chi) at similar to 0.5% for large susceptibilities (low temperatures), indicating a reduction of the coupling strength between mu(+) spins and 4f paramagnetism for temperatures less than or similar to 15 K. We speculate that itinerant Pr3+ quadrupolar excitations, invoked to mediate the superconducting Cooper-pair interaction, might modify the mu(+) -4f ion indirect spin-spin interaction. - D. E. MacLaughlin, P. -C. Ho, Lei Shu, O. O. Bernal, Songrui Zhao, A. A. Dooraghi, T. Yanagisawa, M. B. Maple, R. H. FukudaPHYSICAL REVIEW B 89 (14) 2469-9950 2014/04 [Refereed][Not invited]
Muon spin rotation and relaxation (mu SR) experiments have been carried out to characterize magnetic and superconducting ground states in the Pr1-xNdxOs4Sb12 alloy series. In the ferromagnetic end compound NdOs4Sb12 the spontaneous local field at positive-muon (mu(+)) sites below the ordering temperature T-C is greater than expected from dipolar coupling to ferromagnetically aligned Nd3+ moments, indicating an additional indirect RKKY-like transferred hyperfine mechanism. For 0.45 <= x <= 0.75, mu(+) spin relaxation rates in zero and weak longitudinal applied fields indicate that static fields at mu(+) sites below T-C are reduced and strongly disordered. We argue this is unlikely to be due to reduction of Nd3+ moments, and speculate that the Nd3+-mu(+) interaction is suppressed and disordered by Pr doping. In an x = 0.25 sample, which is superconducting below T-C = 1.3 K, there is no sign of "spin freezing" ( static Nd3+ magnetism), ordered or disordered, down to 25 mK. Dynamic mu(+) spin relaxation is strong, indicating significant Nd- moment fluctuations. The mu(+) diamagnetic frequency shift and spin relaxation in the superconducting vortex-lattice phase decrease slowly below T-C, suggesting pair breaking and/or possible modification of Fermi-liquid renormalization by Nd spin fluctuations. For 0.25 <= x <= 0.75, the mu SR data provide evidence against phase separation; superconductivity and Nd3+ magnetism coexist on the atomic scale. - Maclaughlin, D.E., Ho, P.-C., Shu, L., Bernal, O.O., Zhao, S., Dooraghi, A.A., Yanagisawa, T., Maple, M.B., Fukuda, R.H.Physical Review B - Condensed Matter and Materials Physics 89 (14) 144419.1-144419.12 1098-0121 2014/04 [Refereed][Not invited]
- Polarized Light Microscopic Study of the Hidden Order Phase in URu2Si2Chihiro Tabata, Masashi Tokunaga, Makoto Yokoyama, Hiroyuki Hidaka, Tatsuya Yanagisawa, Hiroshi AmitsukaJPS Conf. Proc. 3 011062 2014 [Refereed][Not invited]
- Simultaneous Measurements of Elastic Constant and Resistivity near the Tc of Non-BCS-Type Superconductor PrOs4Sb1Shota Mombetsu, Taro Murazumi, Kenta Hiura, Hiroyuki Hidaka, Tatsuya Yanagisawa, Hiroshi Amitsuka, M. Brian MapleJPS Conf. Proc. 3 015021 2014 [Refereed][Not invited]
- Yusei SHIMIZU, Yoshinori HAGA, Tatsuya YANAGISAWA, Hiroshi AMITSUKA, Dai AOKI, Jean-Pascal BRISON, Daniel BRAITHWAITEJPS Conf. Proc. 3 015009-1 - 015009-6 2014 [Refereed][Not invited]
- T. Yanagisawa, S. Mombetsu, H. Hidaka, H. Amitsuka, M. Akatsu, S. Yasin, S. Zherlitsyn, J. Wosnitza, K. Huang, M. Janoschek, M. B. MaplePhysical Review B - Condensed Matter and Materials Physics 88 (19) 195150-1 - 195150-5 1098-0121 2013/11/26 [Refereed][Not invited]
We have measured the elastic constant (C11-C12)/2 in URu2Si2 by means of high-frequency ultrasonic measurements in pulsed magnetic fields H [001] up to 61.8 T in a wide temperature range from 1.5 to 116 K. We found a reduction of (C11-C12)/2 that appears only in the temperature and magnetic field region in which URu 2Si2 exhibits a heavy-electron state and hidden order. This change in (C11-C12)/2 appears to be a response of the 5f electrons to an orthorhombic and volume conservative strain field εxx-εyy with Γ3 symmetry. This lattice instability is likely related to a symmetry-breaking band instability that arises due to the hybridization of the localized f electrons with the conduction electrons and is probably linked to the hidden-order parameter of this compound. © 2013 American Physical Society. - Tatsuya Yanagisawa, Shota Mombetsu, Hiroyuki Hidaka, Hiroshi Amitsuka, Mitsuhiro Akatsu, Shadi Yasin, Sergei Zherlitsyn, Jochen Wosnitza, Kevin Huang, M. Brian MapleJ. Phys. Soc. Jpn. 82 (2012) 013601 82 (1) 0031-9015 2013/01 [Refereed][Not invited]
We have performed ultrasonic measurements on single-crystalline URu2Si2 with pulsed magnetic fields, in order to check for possible lattice instabilities due to the hybridized state and the hidden-order state of this compound. The elastic constant (C11-C12)/2, which is associated with a response to the {\Gamma}3-type symmetry-breaking (orthorhombic) strain field, shows a three-step increase at H > 35 T for H || c at low temperatures, where successive meta-magnetic transitions are observed in the magnetization. We discovered a new fact that the absolute change of the softening of (C11-C12)/2 in the temperature dependence is quantitatively recovered at the suppression of hybridized-electronic state and the hidden order in high-magnetic field for H \perp c associated with the successive transitions. The present results suggest that the {\Gamma}3-type lattice instability, is related to both the emergence of the hybridized electronic state and the hidden-order parameter of URu2Si2. On the other hand, magnetic fields H || [100] and [110] enhance the softening of (C11-C12)/2 in the hidden order phase, while no step-like anomaly is observed up to 68.7 T. We discuss the limitation of the localized-electron picture for describing these features of URu2Si2 by examination of a crystalline electric field model in terms of mean-field theory. - Yusei Shimizu, Yoshinori Haga, Yoichi Ikeda, Tatsuya Yanagisawa, Hiroshi AmitsukaPHYSICAL REVIEW LETTERS 109 (21) 217001.1-217001.5 0031-9007 2012/11 [Refereed][Not invited]
We have performed precise dc magnetization measurements for a single crystal of UBe13 down to 0.14 K, up to 80 kOe. We observed a magnetic anomaly in the superconducting (SC) mixed state at a field, named H-Mag* (similar to 26 kOe, at 0.14 K), implying that UBe13 has a magnetically unusual SC state. We studied the magnetization curves of UBe13, assuming that the H-Mag* anomaly originates from (1) and unusual SC diamagnetic response, or (2) a peculiarity of the normal-state magnetization due to vortices in the SC mixed state. The origin of the H-Mag* anomaly is discussed. - Yoichi Ikeda, Shingo Araki, Tatsuo C. Kobayashi, Yusei Shimizu, Tatsuya Yanagisawa, Hiroshi AmitsukaJ Phys Soc Jpn Physical Society of Japan 81 (8) 83701 - 083701-4 0031-9015 2012/06/25 [Refereed][Not invited]
The effects of Ni substitution on Ce(Cu1-xNix)2Si2 have been studied by specific heat and electrical resistivity measurements. The specific heat measurement has revealed that the enhanced quantum fluctuations around an antiferromagnetic quantum critical point are markedly suppressed by Ni substitution, and that the Fermi liquid state recovers in the Nirich region (x > 0.12). The characteristic T-linear dependence of the resistivity has been observed at approximately x ~ 0.10 together with a sign of superconductivity. The variation of n in the form of rho - rho0 = aT^n against Tmax^1, at which the resistivity peaks, coincides with the case of high-pressure experiments on pure CeCu2Si2. The anomalous T-linear behavior appears to occur in the crossover region from the Kondo regime to the valence fluctuation regime rather than in the conventional antiferromagnetic quantum critical region. - 網塚浩, 田端千紘, 日高宏之, 柳澤達也, 横山淳, LUMSDEN M. D, KANCHANAVATEE N, BUTCH N. P, MAPLE M. BNSL News Lett (12-Jan) 13,51-54 2012 [Not refereed][Not invited]
- H. Hidaka, S. M. Ramos, E. N. Hering, M. B. Fontes, E. B. Saitovitch, S. Otani, T. Wakabayashi, Y. Shimizu, T. Yanagisawa, H. AmitsukaINTERNATIONAL CONFERENCE ON STRONGLY CORRELATED ELECTRON SYSTEMS (SCES 2011) 391 1742-6588 2012 [Refereed][Not invited]
We have measured the electrical resistivity of clathrate Ce3Pd20Ge6 under high pressure up to 3.86 GPa in order to investigate pressure effects on two successive phase transitions: O-2(0)-type ferroquadrupole order on Ce-8c site at T-Q = 1.2 K and antiferromagnetic order on Ce-4a site at T-N = 0.75 K. With applying pressure, T-Q stays nearly constant at low pressures and gradually decreases above 2 GPa, while T-N first increases and then decreases above 2.5 GPa. From these results, critical pressures, where T-N T-Q become 0, are roughly estimated to be around 5 - 6 GPa. In addition, we found that the magnetic resistivity, which is obtained by subtracting the resistivity of La3Pd20Ge6 from that Ce3Pd20Ge6, exhibits -lnT dependence in two different temperature ranges, suggesting presence of two different Kondo temperatures originated in the two crystallographic Ce-sites. - Yusei Shimizu, Yoshinori Haga, Kenichi Tenya, Tatsuya Yanagisawa, Hiroyuki Hidaka, Hiroshi AmitsukaINTERNATIONAL CONFERENCE ON STRONGLY CORRELATED ELECTRON SYSTEMS (SCES 2011) 391 1742-6588 2012 [Refereed][Not invited]
We have studied anomalous upper critical field B-c2(T) of a single crystal of UBe13 by DC magnetization measurements down to 0.14 K and up to 8 T. We have observed a broad anomaly and a peak effect below B-c2 in magnetization curves. Although a possibility of the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state has been proposed as an origin of the unusual upper critical field by previous works, our results have shown that thermal equilibrium magnetization curves reveal no step-like behavior, which could be observed at 1st-order phase transition from a superconducting mixed state to the FFLO state. We have also investigated anisotropy of B-c2 for B parallel to < 001 > and B parallel to < 110 >, and found that B-c2 for B parallel to < 001 > is larger than B-c2 for B parallel to < 110 > below similar to 0.5 K. These results might indicate that the anomalous upward curvature of B-c2 in UBe13 is related to anisotropy of B-c2 rather than the FFLO state. - T. Yanagisawa, H. Saito, Y. Watanabe, Y. Shimizu, H. Hidaka, H. AmitsukaINTERNATIONAL CONFERENCE ON STRONGLY CORRELATED ELECTRON SYSTEMS (SCES 2011) 391 1742-6588 2012 [Refereed][Not invited]
Ultrasonic investigations of the elastic constants of non-5f compound ThRu2Si2 were performed in order to highlight possible quadrupolar response in the elastic constants of heavy fermion compound URu2Si2, by using the ThRu2Si2 for backgrounds to subtract the phonon contributions in the elastic constants of URu2Si2. We confirmed that the all-elastic constants of ThRu2Si2 show no elastic anomaly, i.e., increasing monotonically and saturating toward low temperatures, which can be understood regular phonon contributions for the solid states. The background-subtracted (C-11-C-12)2 of URu2Si2 keeps decreasing with decreasing temperatures from 300 K, while other share modes C-44 and C-66 show little change. These contrasts suggest that the Gamma(3)-type quadrupole moment O-2(2) will be still dominant and active in URu2Si2 at low temperatures. - Hiroyuki Hidaka, Sosuke Takahashi, Yusei Shimizu, Tatsuya Yanagisawa, Hiroshi AmitsukaJOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 80 (Supplement A) SA102.1-SA102.3 0031-9015 2011/07 [Refereed][Not invited]
The electrical resistivity rho of the ferromagnet U4Ru7Ge6 has been studied under high pressure up to similar to 4.5 GPa by using an indenter-type high-pressure cell. The Curie temperature T-C = 11.2 K at ambient pressure decreases monotonously with increasing pressure, and seems to disappear at similar to 2.6 GPa, where an enhancement of the coefficient A assuming Fermi liquid regime is observed. This result indicates a presence of a quantum critical point (QCP) of U4Ru7Ge6 at around 2.6 GPa. In addition, non-Fermi liquid behavior (rho similar to T-5/3) predicted by the SCR theory of three dimensional ferromagnet is also observed near the QCP. - YANAGISAWA Tatsuya, TATEIWA Naoyuki, MAYAMA Taichi, SAITO Hitoshi, HIDAKA Hiroyuki, AMITSUKA Hiroshi, HAGA Yoshinori, NEMOTO Yuichi, GOTO TerutakaJ Phys Soc Jpn 80 (Supplement A) SA105.1-SA105.3 0031-9015 2011/07 [Refereed][Not invited]
Ultrasonic measurements of U3Pd20Si6 were performed in order to investigate elastic properties of the cage-structured compound U3Pd20Si6 and also examine a presence of ultrasonic dispersion (UD) due to off-center rattling, which has been observed in the elastic constant C-44 of similar systems R3Pd20Ge6 (R = La - Nd). At temperatures over antiferromagnetic ordering at T-N = 19 K, neither an up-turn anomaly nor frequency dependence of the elastic constants, regarding the UD, was found. On the other hand, the elastic constant C-44 shows pronounced softening due to crystalline electric field effect of U4+ ion's Gamma(5) triplet ground state for both 4a and 8c sites. Below T-N, precipitous elastic softening accompanied by a sudden depression of ultrasonic echo was observed in each ultrasonic mode. A drastic change of Delta C-44/C-44 similar to 30% at T-N, in particular, implies a strong magneto-elastic coupling of 5f-electrons or a possible contribution of a ferroquadrupole interaction to the antiferromagnetism in U3Pd20Si6. - Yusei Shimizu, Yoichi Ikeda, Takumi Wakabayashi, Kenichi Tenya, Yoshinori Haga, Hiroyuki Hidaka, Tatsuya Yanagisawa, Hiroshi AmitsukaJOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 80 (Supplement A) SA100.1-SA100.3 0031-9015 2011/07 [Refereed][Not invited]
Low-temperature specific heat and static dc magnetizetion measurements have been performed for the superconducting state of the heavy-fermion compound UBe13. The superconducting phase diagram B-c2-T (B parallel to [110]) has been obtained by our specific heat and magnetization measurements. From the slope of the upper critical field and specific heat jumps at superconducting transition temperatures in magnetic fields, we have also obtained a temperature dependence of Ginzburg-Landau parameter kappa(2) along [110]. It has been revealed that kappa(2) decreases with decreasing temperature down to 0.5 K, which indicates that a paramagnetic effect may be present at least down to 0.5 K for [110]. - Yusei Shimizu, Yoichi Ikeda, Takumi Wakabayashi, Yoshinori Haga, Kenichi Tenya, Hiroyuki Hidaka, Tatsuya Yanagisawa, Hiroshi AmitsukaJ Phys Soc Jpn Physical Society of Japan 80 (9) 93701 - 093701-4 0031-9015 2011/06/13 [Refereed][Not invited]
We have performed low-temperature specific-heat measurements in magnetic fields for a single crystal UBe13. It has been observed that our sample exhibits a superconducting transition at an intermediate temperature between previously reported values for two variant samples called H type and L type. The specific heat C(T) of our sample shows a T^3 behavior in the temperature range below 0.7 Tc, which is similar to the behavior of the H-type sample, suggesting the existence of point nodes in the superconducting gap function. We have obtained the upper-critical-field curves Hc2 for the [001], [110], and [111] crystal axes, which show no anisotropy at least down to the lowest measured temperature of 0.5 K. We have also derived the Maki parameter kappa2, and it has been revealed that the kappa2 steeply decreases isotropically upon cooling just below Tc. Paramagnetic effects and the symmetry of Cooper pairing of UBe13 are discussed. - Tatsuya Yanagisawa, Hitoshi Saito, Hiroyuki Hidaka, Hiroshi Amitsuka, Koji Araki, Mitsuhiro Akatsu, Yuichi Nemoto, Terutaka Goto, Pei-Chun Ho, Ryan E. Baumbach, M. Brian MapleJ Phys Soc Jpn Physical Society of Japan 80 (4) 43601 - 043601-4 0031-9015 2011/04 [Refereed][Not invited]
Elastic properties of the filled skutterudite compound SmOs$_4$Sb$_{12}$ have been investigated by ultrasonic measurements. The elastic constant $C_{11}(\omega)$ shows two ultrasonic dispersions at $\sim$15 K and $\sim$53 K for frequencies $\omega$ between 33 and 316 MHz, which follow a Debye-type formula with Arrhenius-type temperature-dependent relaxation times, and remain unchanged even with applied magnetic fields up to 10 T. The corresponding activation energies were estimated to be $E_2$ = 105 K and $E_1$ = 409 K, respectively. The latter, $E_1$, is the highest value reported so far in the Sb-based filled skutterudites. The presence of magnetically robust ultrasonic dispersions in SmOs$_4$Sb$_{12}$ implies a possibility that an emergence of a magnetically insensitive heavy fermion state in this system is associated with a novel local charge degree of freedom which causes the ultrasonic dispersion. - P. C. Ho, T. Yanagisawa, W. M. Yuhasz, A. A. Dooraghi, C. C. Robinson, N. P. Butch, R. E. Baumbach, M. B. MaplePhysical Review B - Condensed Matter and Materials Physics 83 (2) 024511.1-024511.6 1098-0121 2011/01/31 [Refereed][Not invited]
Superconductivity, magnetic order, and the high field ordered phase have been investigated in the filled skutterudite system Pr1-xNd xOs4Sb12 as a function of composition x in magnetic fields up to 9 T and at temperatures between 50 mK and 10 K. Electrical resistivity measurements indicate that the high field ordered phase, which has been identified with antiferroquadruoplar order, persists to x ∼ 0.5. The superconducting critical temperature Tc of PrOs4Sb 12 is depressed linearly with Nd concentration to x ∼ 0.55, whereas the Curie temperature TFM of NdOs4Sb12 is depressed linearly with Pr composition to (1-x) ∼ 0.45. In the superconducting region, the upper critical field Hc2(x,0) is depressed quadratically with x in the range 0 < x 0.3, exhibits a kink at x ≈ 0.3, and then decreases linearly with x in the range 0.3 ≲ x ≲ 0.6. The behavior of Hc2(x,0) appears to be a result of pair breaking caused by the applied magnetic field and the exchange field associated with the polarization of the Nd magnetic moments in the superconducting state. From magnetic susceptibility measurements, the correlations between the Nd moments in the superconducting state appear to change from ferromagnetic in the range 0.3 ≲ x ≲ 0.6 to antiferromagnetic in the range 0 < x ≲ 0.3. Specific-heat measurements on a sample with x = 0.45 indicate that magnetic order may occur in the superconducting state, as is also inferred from the depression of Hc2(x,0) with x. © 2011 American Physical Society. - P. -C. Ho, T. Yanagisawa, W. M. Yuhasz, A. A. Dooraghi, C. C. Robinson, N. P. Butch, R. E. Baumbach, M. B. MaplePHYSICAL REVIEW B 83 (2) 2469-9950 2011/01 [Refereed][Not invited]
Superconductivity, magnetic order, and the high field ordered phase have been investigated in the filled skutterudite system Pr1-xNdxOs4Sb12 as a function of composition x in magnetic fields up to 9 T and at temperatures between 50 mK and 10 K. Electrical resistivity measurements indicate that the high field ordered phase, which has been identified with antiferroquadruoplar order, persists to x similar to 0.5. The superconducting critical temperature T-c of PrOs4Sb12 is depressed linearly with Nd concentration to x similar to 0.55, whereas the Curie temperature T-FM of NdOs4Sb12 is depressed linearly with Pr composition to (1 - x) similar to 0.45. In the superconducting region, the upper critical field H-c2(x, 0) is depressed quadratically with x in the range 0 < x less than or similar to 0.3, exhibits a kink at x approximate to 0.3, and then decreases linearly with x in the range 0.3 less than or similar to x less than or similar to 0.6. The behavior of H-c2(x, 0) appears to be a result of pair breaking caused by the applied magnetic field and the exchange field associated with the polarization of the Nd magnetic moments in the superconducting state. From magnetic susceptibility measurements, the correlations between the Nd moments in the superconducting state appear to change from ferromagnetic in the range 0.3 less than or similar to x less than or similar to 0.6 to antiferromagnetic in the range 0 < x less than or similar to 0.3. Specific-heat measurements on a sample with x = 0.45 indicate that magnetic order may occur in the superconducting state, as is also inferred from the depression of H-c2(x, 0) with x. - Yusei Shimizu, Yoichi Ikeda, Takumi Wakabayashi, Kenichi Tenya, Yoshinori Haga, Hiroyuki Hidaka, Tatsuya Yanagisawa, Hiroshi AmitsukaINTERNATIONAL CONFERENCE ON STRONGLY CORRELATED ELECTRON SYSTEMS (SCES 2010) 273 1742-6588 2011 [Refereed][Not invited]
Static dc magnetization measurements in the superconducting mixed state of a single crystal UBe13 along the [110] axis were performed by means of a capacitance Faraday-force method down to 0.24 K. Below the upper critical field B-c2, not only a peak effect but also an additional broad anomaly have been observed in magnetization curves. We report superconducting phase diagram of UBe13 obtained by our magnetization measurements, including these anomalies. - H. Hidaka, A. Tanaka, S. Takahashi, T. Yanagisawa, H. AmitsukaINTERNATIONAL CONFERENCE ON STRONGLY CORRELATED ELECTRON SYSTEMS (SCES 2010) 273 1742-6588 2011 [Refereed][Not invited]
We have studied the effects of pressure on the incommensurate (IC)-commensurate (C) antiferromagnetic (AFM) phase transition of UPd2Si2 by measuring the electrical resistivity up to 4.21 GPa. We observed that the low-temperature C-AFM (type-I) phase expands and prevails over the IC-AFM phase as pressure is increased. The obtained pressure-temperature phase diagram strongly suggests the existence of a novel bicritical point, more specifically, the so-called Lifshitz point at P-c similar to 3.4 GPa, where magnetic modulation continuously changes from IC to C. - T. Yanagisawa, H. Saitoh, H. Hidaka, H. Amitsuka, T. Cichorek, Z. Henkie, M. B. MapleINTERNATIONAL CONFERENCE ON STRONGLY CORRELATED ELECTRON SYSTEMS (SCES 2010) 273 1742-6588 2011 [Refereed][Not invited]
Ultrasonic measurements with frequencies varying between 73 and 160 MHz were performed for the LaRu4As12 single crystal. This As-based filled skutterudite compound is a BCS-type superconductor with T-SC as high as 10.3 K. In order to examine a presence of off-center rattling motion in LaRu4As12, we measured elastic constants C-L111 = (C-11 2C(12) 4C(44))/3 and C-T111 = (C-11- C-12 +4C(44))/3, which are related to longitudinal and transverse sound waves propagating along the [111] direction, respectively. No ultrasonic dispersion was found in the whole temperature range from 1.4 to 300 K. - T Yanagisawa, H Saito, T Mayama, Y Ikeda, H Hidaka, M Yokoyama, H AmitsukaJournal of Physics: Conference Series 200 (1) 012236 - 012236 1742-6596 2010/02 [Refereed]
- H. Amitsuka, T. Inami, M. Yokoyama, S. Takayama, Y. Ikeda, I. Kawasaki, Y. Homma, H. Hidaka, T. YanagisawaINTERNATIONAL CONFERENCE ON MAGNETISM (ICM 2009) 200 1742-6588 2010 [Refereed][Not invited]
We have studied a puzzling phase below 17.5 K of URu2Si2 by means of resonant Xray scattering (RXS) near the U M-IV absorption edge (E similar to 3.73 keV), using a high-quality single-crystalline sample with low residual stress. We reconfirm that a commensurate (003) superlattice reflection comes purely from antiferromegnetic dipolar order with ordering wave vector Q(AF) = (1, 0, 0). No other traces of significant RXS have been detected in a major region of (h0l) plane, indicating absence of quadrupolar order within a searched Q range including a conceivable nesting vector Q* = (1.4, 0, 0). - T. Yanagisawa, H. Saito, T. Mayama, Y. Ikeda, H. Hidaka, M. Yokoyama, H. AmitsukaINTERNATIONAL CONFERENCE ON MAGNETISM (ICM 2009) 200 1742-6588 2010 [Refereed][Not invited]
Ultrasonic measurements on Rh-substitution system U(Ru1-xRhx)(2)Si-2 (x = 0,0.02 and 0.07) were performed in order to investigate lattice properties for low temperature phase transitions of 'hidden order'(HO) phase and antiferromagnetc (AFM) phase. Elastic constant C-11 vs. T of the x = 0.02 and 0.07 samples exhibit a depression below 80 K, which is similar to a softening in the non-doped sample which had already been reported. The C-11 of x = 0.02 exhibits a step-like anomaly at 14.0 K and an additional softening of 3.2% with minimum at 6.7 K, which correspond to HO and AFM transitions, respectively. The C-11 in x = 0.07 sample only exhibits a shoulder-like anomaly at around 17 K and continue to depress down to 4.2 K. - Yoichi Ikeda, Makoto Yokoyama, Daichi Nishikawa, Hiroyuki Hidaka, Tatsuya Yanagisawa, Kenichi Tenya, Shuzo Kawarazaki, Taku J. Sato, Hideki Yoshizawa, Hiroshi AmitsukaJournal of Physics: Conference Series 200 (SECTION 1) 1742-6588 2010 [Refereed][Not invited]
Elastic neutron-scattering experiment was performed on the heavy-fermion superconductor URu2Si2 under uniaxial stress in order to search a sign of a hidden order parameter. Contour maps of neutron-scattering at 1.5 K were achieved by mesh scanning. No additional magnetic signal exists in (h0l) and (hhl) planes except for a well-known weak antiferromagnetic signal with magnetic-propagation vector of Q = (100) within the present experimental accuracy and scanned area. © 2010 IOP Publishing Ltd. - Hiroyuki Hidaka, Yoichi Ikeda, Ikuto Kawasaki, Tatsuya Yanagisawa, Hiroshi AmitsukaPHYSICA B-CONDENSED MATTER 404 (19) 3005 - 3007 0921-4526 2009/10 [Refereed][Not invited]
We have carried out specific heat measurements on EuIn2P2 at high magnetic fields perpendicular to the c-axis in the hexagonal crystal structure in order to understand its thermal properties. The temperature dependence of the specific heat exhibits a clear lambda-type anomaly due to a magnetic transition at T-C = 24 K, indicating that the magnetic transition is of second-order. The lambda-type anomaly becomes markedly broader with increasing the magnetic field. This remarkable field-dependence is consistent with the results of previous magnetization measurements which suggest that Eu2+ magnetic moments align ferromagnetically perpendicular to the c-axis below T-C. In addition, a hump in the specific heat is observed around 7 K, which can be ascribed to the Zeeman splitting of the Eu2+ multiplet by internal magnetic fields. (C) 2009 Elsevier B.V. All rights reserved. - Ikuto Kawasaki, Daichi Nishikawa, Hiroyuki Hidaka, Tatsuya Yanagisawa, Kenichi Tenya, Makoto Yokoyama, Hiroshi AmitsukaPHYSICA B-CONDENSED MATTER 404 (19) 2908 - 2911 0921-4526 2009/10 [Refereed][Not invited]
In order to investigate magnetic properties around a quantum critical point of CePt1-xRhx alloys, we have performed the ac-susceptibility (chi(ac)) measurements with field frequency ranging from omega/2 pi = 0 (dc magnetization) to 1113 Hz for temperature down to 100mK on polycrystalline CePt1-xRhx (x = 0.5, 0.6). The in-phase component of chi(ac) exhibits a pronounced peak at T-f. The peak magnitude and T-f show significant field-frequency dependence. In addition, a staircaselike hysteresis loop of magnetization was observed below 200mK. From the dynamical analyses of chi(ac) we suggest that CePt0.5Rh0.5 and CePt0.4Rh0.6 can be described as cluster-glass systems. (C) 2009 Published by Elsevier B.V. - Tatsuya Yanagisawa, Taichi Mayama, Hiroyuki Hidaka, Hiroshi Amitsuka, Akio Yamaguchi, Koji Araki, Yuichi Nemoto, Terutaka Goto, Naoya Takeda, Pei-Chun Ho, M. Brian MaplePHYSICA B-CONDENSED MATTER 404 (19) 3235 - 3237 0921-4526 2009/10 [Refereed][Not invited]
Ultrasonic measurements on a Pr0.55Nd0.45Os4Sb12 single crystal for temperature down to 20mK and frequencies up to 245 MHz were performed in order to investigate off-center rattling motion of rare-earth ions. The elastic constant C-11 exhibits double ultrasonic dispersions at similar to 15 and similar to 40 K, which are similar to the features found in NdOs4Sb12. The estimated activation energy E-1 = 240 K corresponding to the 40 K-dispersion, possesses an intermediate value between PrOs4Sb12 (E-1 = 115 K) and NdOs4Sb12 (E-1 = 337 K). (C) 2009 Elsevier B.V. All rights reserved. - Terutaka Goto, Tomyuki Watanabe, Seiji Tsuduku, Haruki Kobayashi, Yuichi Nemoto, Tatsuya Yanagisawa, Mitsuhiro Akatsu, Genki Ano, Osamu Suzuki, Naoya Takeda, Andreas Donni, Hideaki KitazawaJOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 78 (2) 0031-9015 2009/02 [Refereed][Not invited]
Low-temperature elastic properties of the clathrate compound Ce3Pd20Si6 were investigated using ultrasonic measurements. Pronounced softening of elastic constants (C-11 - C-12)/2 and C-44 with decreasing temperature indicates a precursor of electric quadrupole ordering due to it Gamma(8) quartet ground sate with an orbital degeneracy for 8c site of it Ce ion. A minimum of (C-11 - C-12)/2 at T-C = 170 mK indicates a transition from paramagnetic phase I to an ordered phase III. Applied magnetic fields induce an antiferro-quadrupole (AFQ) ordered phase II with highly anisotropic character depending on the field direction, which resembles the AFQ phase with O-xy-type order parameter in CeB6 with the Gamma(8) ground sate. The order parameter of the phase III may be characterized by either magnetic dipole or magnetic octupole. The Gamma(7) ground state at 4a site may fall into it singlet screened by conduction electrons at low temperatures Without long-range magnetic ordering. - GOTO Terutaka, WATANABE Tomoyuki, TSUDUKU Seiji, KOBAYASHI Haruki, NEMOTO Yuichi, YANAGISAWA Tatsuya, AKATSU Mitsuhiro, ANO Genki, SUZUKI Osamu, TAKEDA Naoya, DONNI Andreas, KITAZAWA HideakiJournal of the Physical Society of Japan 社団法人日本物理学会 78 (2) "024716 - 1"-"024716-9" 0031-9015 2009/02 [Refereed][Not invited]
Low-temperature elastic properties of the clathrate compound Ce_3Pd_<20>Si_6 were investigated using ultrasonic measurements. Pronounced softening of elastic constants (C_<11>-C_<12>)/2 and C_<44> with decreasing temperature indicates a precursor of electric quadrupole ordering due to a Γ_8 quartet ground sate with an orbital degeneracy for 8c site of a Ce ion. A minimum of (C_<11>-C_<12>)/2 at T_C=170mK indicates a transition from paramagnetic phase I to an ordered phase III. Applied magnetic fields induce an antiferro-quadrupole (AFQ) ordered phase II with highly anisotropic character dep... - Tatsuya Yanagisawa, Pei-Chun Ho, William M. Yuhasz, M. Brian Maple, Yuri Yasumoto, Hiromu Watanabe, Yuichi Nemoto, Terutaka GotoJOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 77 (7) 074607.1-074607.5 - 1"-"074607-5" 0031-9015 2008/07 [Refereed][Not invited]
The off-center rattling of Nd rare-earth ions in the filled skutterudite compound NdOs4Sb12 has been investigated by ultrasonic measurement. The longitudinal C-11 mode for frequencies between 34 and 253MHz shows a marked frequency dependence in elastic constant and ultrasonic attenuations at two different temperatures centered at around 45 and 15K. The relaxational frequency dependence of ultrasonic dispersion reveals a thermally activated Gamma(23)-type off-center motion of Nd-ions, involving local charge fluctuations with Gamma(23) symmetry in the (OsSb3)(4) cage. An attempt time tau(0,(1)) = 7.5 x 10(-12) s and an activation energy E-1 = 337 K were obtained from fits to the dispersion at around 45 K. The presence of another dispersion at lower temperatures of around 15 K implies that the rattling in NdOs4Sb12 has an additional low-energy excitation characterized by a lower activation energy E-2 similar to 67 K with an attempt time tau(0,(2)) = 5.1 x 10(-11) s. - M. B. Maple, Z. Henkie, R. E. Baumbach, T. A. Sayles, N. P. Butch, P. C. Ho, T. Yanagisawa, W. M. Yuhasz, R. Wawryk, T. Cichorek, A. PietraszkoJournal of the Physical Society of Japan The Physical Society of Japan 77 7 - 13 0031-9015 2008/07 [Refereed][Not invited]
In order to elucidate the variety of correlated electron phenomena found in filled skutterudite compounds, experiments were performed on single crystals of ternary Ce- and Pr-based filled skutterudite arsenides LnT 4 As 12 (Ln = Ce, Pr; T = Fe, Ru, Os) and pseudoternary Pr-based skutterudite antimonides Pr(Os 1-x Ru x ) 4 Sb 12 and Pr 1-x Nd x Os 4 Sb 12 . For example, the intermediate valence compound CeRu 4 As 12 exhibits non-Fermi liquid characteristics, while the compounds PrT 4 As 12 display ferromagnetic order (18 K) for T = Fe, BCS superconductivity (2.4 K) for T = Ru, unknown order (2.3 K) and antiferromagnetic order (2.2 K) for T = Os. PrOs 4 As 12 appears to be a Kondo lattice system with a small Kondo temperature (∼ 1 K) and an electronic specific heat coefficient γ ∼ 1 J/mol K 2 . The T-x phase diagrams of Pr(Os 1-x Ru x ) 4 Sb 12 and Pr 1-x Nd x Os 4 Sb 12 reveal regions of superconductivity with different order parameter symmetry and magnetic order. ©2008 The Physical Society of Japan. - P-C Ho, N. P. Butch, V. S. Zapf, T. Yanagisawa, N. A. Frederick, S. K. Kim, W. M. Yuhasz, M. B. Maple, J. B. Betts, A. H. LacerdaJOURNAL OF PHYSICS-CONDENSED MATTER 20 (21) 0953-8984 2008/05 [Refereed][Not invited]
To study the possible competition between unconventional and Bardeen-Cooper-Schrieffer superconductivity in the filled skutterudites Pr(Os(1-x)Ru(x))(4)Sb(12), the evolution of superconductivity and the high field ordered phase in single-crystal specimens has been investigated by means of electrical resistivity measurements in magnetic fields up to 18 T. Whereas the upper critical field H(c2)(T) curves have conventional shapes for x < 0.4, the H(c2)(T) curves are nearly linear for x greater than or similar to 0.4. For all x, H(c2)(0) matches the calculated value of the orbital critical field. Features in the electrical resistivity associated with the high field ordered phase, observed clearly for PrOs(4)Sb(12), weaken with increasing x and vanish for x greater than or similar to 0.1. - T. A. Sayles, W. M. Yuhasz, J. Paglione, T. Yanagisawa, J. R. Jeffries, M. B. Maple, Z. Henkie, A. Pietraszko, T. Cichorek, R. Wawryk, Y. Nemoto, T. GotoPhysical Review B - Condensed Matter and Materials Physics 77 (14) 1098-0121 2008/04/29 [Refereed][Not invited]
A variety of thermodynamic and transport measurements were made on high-quality single crystals of the Pr-based filled skutterudite compound PrFe4 As12. Abrupt features in magnetization, ac susceptibility, specific heat, resistivity, thermoelectric power, and ultrasonic velocity reveal the onset of long range ferromagnetic order below ΘC =18K. The low-temperature magnetic susceptibility is characterized by a Curie-Weiss law with an effective moment of 3.52 μB /f.u. and a saturation magnetization of 2.3 μB /f.u., which is consistent with a magnetic Γ5 triplet ground state. A gaplike reduction of the large electronic specific heat coefficient of 340mJ/mol K2 and several other features point to a strongly correlated electron behavior that is likely coupled to a change in magnetic and/or structural order near T12K. Furthermore, this complex magnetic state is found to be strongly field dependent, as evidenced by a change in the easy axis at low fields and an additional contribution to thermal conductivity appearing only at high fields. © 2008 The American Physical Society. - T. A. Sayles, W. M. Yuhasz, J. Paglione, T. Yanagisawa, J. R. Jeffries, M. B. Maple, Z. Henkie, A. Pietraszko, T. Cichorek, R. Wawryk, Y. Nemoto, T. GotoPHYSICAL REVIEW B 77 (14) 2469-9950 2008/04 [Refereed][Not invited]
A variety of thermodynamic and transport measurements were made on high-quality single crystals of the Pr-based filled skutterudite compound PrFe4As12. Abrupt features in magnetization, ac susceptibility, specific heat, resistivity, thermoelectric power, and ultrasonic velocity reveal the onset of long range ferromagnetic order below Theta(C)=18 K. The low-temperature magnetic susceptibility is characterized by a Curie-Weiss law with an effective moment of 3.52 mu(B)/f.u. and a saturation magnetization of 2.3 mu(B)/f.u., which is consistent with a magnetic Gamma(5) triplet ground state. A gaplike reduction of the large electronic specific heat coefficient of 340 mJ/mol K-2 and several other features point to a strongly correlated electron behavior that is likely coupled to a change in magnetic and/or structural order near T-*similar or equal to 12 K. Furthermore, this complex magnetic state is found to be strongly field dependent, as evidenced by a change in the easy axis at low fields and an additional contribution to thermal conductivity appearing only at high fields. - T. Yanagisawa, W. M. Yuhasz, P-C. Ho, M. B. Maple, H. Watanabe, Y. Yasumoto, Y. Nemoto, T. GotoPHYSICA B-CONDENSED MATTER 403 (5-9) 735 - 738 0921-4526 2008/04 [Refereed][Not invited]
Ultrasonic investigation for the single crystals of ferromagnetic filled skutterudite compound NdOs4Sb12 was performed. A marked frequency dependence of the ultrasonic dispersion has been observed in a longitudinal elastic constant C-11 at temperature centered around 45 K; however, no dispersion was measured in the transverse elastic constant C-44. Such a clear mode difference in the ultrasonic dispersion, which has been found in PrOs4Sb12, strongly suggests that Nd ion in NdOs4Sb12 bears thermally activated off-center rattling effect. (C) 2007 Elsevier B.V. All rights reserved. - P. -C. Ho, T. Yanagisawa, N. P. Butch, W. M. Yuhasz, C. C. Robinson, A. A. Dooraghi, M. B. MaplePHYSICA B-CONDENSED MATTER 403 (5-9) 1038 - 1040 0921-4526 2008/04 [Refereed][Not invited]
We report the results of recent electrical resistivity measurements on the two pseudoternary systems Pr(Os1-xRux)(4)Sb-12 and Pr1-xNdxOs4Sb12, which show the evolution of superconductivity (SC) and the high field ordered phase (HFOP) with respect to the substituent concentration. In Pr(Os1-xRux)(4)Sb-12, there appears to be competition between unconventional and conventional SC, whereas in Pr1-xNdxOs4Sb12, there is competition between SC and ferromagnetism (FM). Features in the electrical resistivity related to the HFOP disappear for x >= 0.1 in Pr(Os1-xRux)(4)Sb-12, and persist up to at least x similar to 0.5 in Pr1-xNdxOs4Sb12. (c) 2007 Elsevier B.V. All rights reserved. - T. A. Sayles, W. M. Yuhasz, J. Paglione, T. Yanagisawa, J. R. Jeffries, M. B. Maple, Z. Henkie, A. Pietraszko, T. Cichorek, R. Wawryk, Y. Nemoto, T. GotoPHYSICA B-CONDENSED MATTER 403 (5-9) 869 - 870 0921-4526 2008/04 [Refereed][Not invited]
Magnetization M(H,T), specific heat C(T), and electrical resistivity p(T), measurements were performed on single crystals of the Pr-based filled skutterudite compound PrFe4As12. M(H) isotherms indicate a saturation magnetization of 2.3 mu(B)/f.u., and Arrott analysis reveals a Curie temperature T-C = 18.2 K and saturated moment Mat = 2.0 mu(B)/f.u. Curie-Weiss analysis of magnetic susceptibility, chi, reveals two distinct regions: for T > 100 K, the effective moment mu(eff) = 3.98 mu(B) and the Curie-Weiss temperature theta(CW) = 4.1 K, while for 19.5 < T< 75 K, mu(eff) = 3.52 mu(B) and theta(CW) = 17.7 K. C(T) and rho(7) show distinct features at T-C, while the ac susceptibility exhibits lower temperature features, possibly associated with changes in magnetic structure. (c) 2007 Elsevier B.V. All rights reserved. - T. Yanagisawa, W. M. Yuhasz, T. A. Sayles, P. -C. Ho, M. B. Maple, H. Watanabe, Y. Yasumoto, Y. Nemoto, T. GotoPHYSICAL REVIEW B 77 (9) 1098-0121 2008/03 [Refereed][Not invited]
Elastic constant measurements down to 0.48 K and in magnetic fields up to 11 T were performed on a single crystal of the filled skutterudite compound PrOs(4)As(12). The longitudinal C(L111)= C(B)+ 4C(44)/3 mode shows Curie-type softening below similar to 25 K, which is explained in terms of the quadrupole susceptibility modified by a crystalline electric field with a Gamma((2))(4) ground state. A detailed H-T phase diagram for H parallel to[111] is compiled with the elastic anomalies, which appear on the boundaries of two ordered phases at temperatures below 2.3 K and in fields below 3 T. The intermediate phase between 2 and 2.5 T assumes the aspect of antiferroquadrupolar ordering. - K. Araki, T. Goto, Y. Nemoto, T. Yanagisawa, B. LuethiEUROPEAN PHYSICAL JOURNAL B 61 (3) 257 - 259 1434-6028 2008/02 [Refereed][Not invited]
The temperature dependence of the elastic constants in Tb3Ga5O12 was measured and analysed with a simple crystal field model. The magneto-elastic coupling constants have been deduced from this experiment. The coupling constant g(Gamma 5), related to the c(44) mode, is anomalously large. These coupling constants are important for the interpretation of the phonon Hall effect. - R. Wawryk, O. Zogal, A. Pietraszko, S. Paluch, T. Cichorek, W. M. Yuhasz, T. A. Sayles, P. -C. Ho, T. Yanagisawa, N. P. Butch, M. B. Maple, Z. HenkieJOURNAL OF ALLOYS AND COMPOUNDS 451 (1-2) 454 - 456 0925-8388 2008/02 [Refereed][Not invited]
We have grown single crystals of LaOs4As12 and PrOs4As12, which crystallize in the LaFe4P12-type structure (Im (3) over bar space group) with the lattice parameters of 8.542(1)angstrom and 8.520(1)angstrom, respectively. From a narrow La-139 NMR line, we estimated an appreciable Knight shift (K-139) and a relatively long spin-lattice-relaxation time in the non-4f electron system LaOs4As12. Surprisingly, while K-139 vary non-monotonically with temperature, the magnetic susceptibility increases upon cooling over the whole temperature range. Interestingly, the high-temperature dependence of the thermoelectric power of LaOs4As12 is remarkably similar to that one of PrOs(4)AS(12). (C) 2007 Elsevier B.V. All rights reserved. - Yuri Yasumoto, Akio Yamaguchi, Tatsuya Yanagisawa, Yuichi Nemoto, Terutaka Goto, Akira OchiaiJOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 77 242 - 244 0031-9015 2008/01 [Refereed][Not invited]
Off-center rattling of La-ion in the filled skutterudite compound LaOs4Sb12 has been investigated by means of ultrasonic measurements. An elastic constant C-11 shows a remarkable frequency dependence in elastic constant and ultrasonic attenuation at around 25 K. This frequency dependent ultrasonic dispersion reveals thermally activated Gamma(23)-type off-center rattling of La-ion. An attempt time tau(0) = 5.0x10(-11) sec and an activation energy E = 127 K were obtained from the analysis. - Yuichi Nemoto, Tatsuya Yanagisawa, Yuri Yasumoto, Haruki Kobayashi, Akio Yamaguchi, Seiji Tsuduku, Terutaka Goto, Naoya Takeda, Akira Ochiai, Hitoshi Sugawara, Hideyuki Sato, Hideaki KitazawaJOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 77 153 - 158 0031-9015 2008/01 [Refereed][Not invited]
We have performed ultrasonic experiments on clathrate compounds ROs4Sb12 and R3Pd20Ge6 to explore rattling and tunneling of a guest rattler's motion. We have found frequency dependence of the elastic constants and ultrasonic attenuations, which is called as ultrasonic dispersion, due to thermally activated rattling. At low temperatures, Curie-type elastic softening obeying 1/T with antiferro-type intersite interaction, which corresponds to quantum tunneling, appears and continues even to the lowest 20 mK in LaOs4Sb12 and La3Pd20Ge6. The understanding of the local charge fluctuation, rattling and tunneling, being coupled to conduction electrons in metals is a basic issue in the aspect of electron-phonon interaction in strongly correlated phenomena such as heavy fermion state, superconductivity and multi-channel Kondo screening effect. - Haruki Kobayashi, Seiji Tsuduku, Osamu Suzuki, Tatsuya Yanagisawa, Yuichi Nemoto, Terutaka Goto, Andreas Doenni, Hideaki Kitazawa, Naoya TakedaJOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 77 263 - 265 0031-9015 2008/01 [Refereed][Not invited]
Electric quadrupole effects in a Pr-based clathrate compound Pr3Pd20Si6 have been investigated by ultrasonic measurements. Elastic constants of (C-11 - C-12)/2 and C-44 in Pr3Pd20Si6 show curie-type softenings with decreasing temperature below 20 K, which are described in terms of quadrupole effects of 4f-electron for the ground state either Gamma(3) doublet or Gamma(5) triplet. H-T phase diagram of Pr3Pd20Si6 under the magnetic fields along [110] is obtained from elastic anomalies in (C-11 - C-12)/2 mode. - Kouji Araki, Terutaka Goto, Yuichi Nemoto, Tatsuya Yanagisawa, Bruno LuethiJOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 77 269 - 271 0031-9015 2008/01 [Refereed][Not invited]
We have investigated elastic properties of a garnet-type single crystal Tb3Ga5O12 by ultrasonic measurements. Temperature dependence of the transverse elastic constants (C-11 - C-12)/2 and C-44 shows strong Curie-type softening below 150 K with minima around 30 - 50 K and also below 5 K. These effects are due to quadrupole susceptibilities for the crystalline electric field system with a pseudo-doublet Gamma(3) ground state and an excited triplet Gamma(5) at 57.3 K. Magnetic field dependence of the (C-11 - C-12)/2 mode in H parallel to [110] shows step-like anomaly due to a level crossing at around 9.5 T. - Kouji Araki, Terutaka Goto, Yuichi Nemoto, Tatsuya Yanagisawa, Bruno LüthiJournal of the Physical Society of Japan 77 269 - 271 1347-4073 2008 [Refereed][Not invited]
We have investigated elastic properties of a garnet-type single crystal Tb3Ga5O12 by ultrasonic measurements. Temperature dependence of the transverse elastic constants (C11C 12)/2 and C44 shows strong Curie-type softening below 150 K with minima around 30 - 50 K and also below 5 K. These effects are due to quadrupole susceptibilities for the crystalline electric field system with a pseudo-doublet Γ3 ground state and an excited triplet Γ5 at 57.3 K. Magnetic field dependence of the (C 11C12)/2 mode in H ∥ [110] shows step-like anomaly due to a level crossing at around 9.5 T. ©2008 The Physical Society of Japan. - Haruki Kobayashi, Seiji Tsuduku, Osamu Suzuki, Tatsuya Yanagisawa, Yuichi Nemoto, Terutaka Goto, Andreas Dönni, Hideaki Kitazawa, Naoya TakedaJournal of the Physical Society of Japan 77 263 - 265 1347-4073 2008 [Refereed][Not invited]
Electric quadrupole effects in a Pr-based clathrate compound Pr 3Pd20Si6 have been investigated by ultrasonic measurements. Elastic constants of (C11 - C12)/2 and C44 in Pr3Pd20Si6 show curie-type softenings with decreasing temperature below 20 K, which are described in terms of quadrupole effects of 4f-electron for the ground state either Γ3 doublet or Γ5 triplet. H-T phase diagram of Pr3Pd20Si6 under the magnetic fields along [110] is obtained from elastic anomalies in (C11 - C12)/2 mode. ©2008 The Physical Society of Japan. - T. Yanagisawa, Y. Yasumoto, Y. Nemoto, T. Goto, W. M. Yuhasz, P. C. Ho, M. B. Maple, Z. Henkie, A. PietraszkoJournal of the Physical Society of Japan 77 225 - 228 1347-4073 2008 [Refereed][Not invited]
Ultrasonic investigation of a single crystal of the filled skutterudite antiferromagnetic compound PrOs4As12 was performed. Curie-type softening appeared in CL111 = CB + 4/3C 44 and CT111 = 2/3 (C11-C12)/2 + 4/3C44, is explained in terms of the quadrupole susceptibility modified by a crystalline electric field with a Γ4 (2)-triplet ground state and a Γ1-singlet first excited state. The quadrupole susceptibility analysis finds that the intersite quadrupole interactions in this compound are negative, indicating an antiferro-quadrupolar type interaction. Additional ultrasonic features, appeared in an ordered phase under magnetic fields between 2 T and 3 T for H∥ [111] and H∥ [110], suggest the existence of another intermediate phase boundary. Magnetic field-temperature (H-T) phase diagrams for H∥ [111] and H∥ [110], which exhibits strong magnetic anisotropy, were obtained. ©2008 The Physical Society of Japan. - Yuri Yasumoto, Akio Yamaguchi, Tatsuya Yanagisawa, Yuichi Nemoto, Terutaka Goto, Akira OchiaiJournal of the Physical Society of Japan 77 242 - 244 1347-4073 2008 [Refereed][Not invited]
Off-center rattling of La-ion in the filled skutterudite compound LaOs 4Sb12 has been investigated by means of ultrasonic measurements. An elastic constant C11 shows a remarkable frequency dependence in elastic constant and ultrasonic attenuation at around 25 K. This frequency dependent ultrasonic dispersion reveals thermally activated Γ23-type off-center rattling of La-ion. An attempt time τ0 = 5.0×10-11 sec and an activation energy E = 127 K were obtained from the analysis. ©2008 The Physical Society of Japan. - Yuichi Nemoto, Tatsuya Yanagisawa, Yuri Yasumoto, Haruki Kobayashi, Akio Yamaguchi, Seiji Tsuduku, Terutaka Goto, Naoya Takeda, Akira Ochiai, Hitoshi Sugawara, Hideyuki Sato, Hideaki KitazawaJournal of the Physical Society of Japan 77 153 - 158 1347-4073 2008 [Refereed][Not invited]
We have performed ultrasonic experiments on clathrate compounds ROs 4Sb12 and R3Pd20Ge6 to explore rattling and tunneling of a guest rattler's motion. We have found frequency dependence of the elastic constants and ultrasonic attenuations, which is called as ultrasonic dispersion, due to thermally activated rattling. At low temperatures, Curie-type elastic softening obeying 1/T with antiferro-type intersite interaction, which corresponds to quantum tunneling, appears and continues even to the lowest 20 mK in LaOs4Sb12 and La3Pd20Ge6. The understanding of the local charge fluctuation, rattling and tunneling, being coupled to conduction electrons in metals is a basic issue in the aspect of electron-phonon interaction in strongly correlated phenomena such as heavy fermion state, superconductivity and multi-channel Kondo screening effect. ©2008 The Physical Society of Japan. - Observation of vacancy in silicon using low-temperature ultrasonic measurementsT. Goto, H. yamada-Kaneta, M. Hikin, H. Watanabe, K. Sato, Y. Nemoto, T. Yanagisawa, S. NakamuraProceeding of the science and technology of silicon materials 2007 69 - 74 2007/11 [Not refereed][Not invited]
- Piezoelectric ZnO sputtering on crystalline silicon for low-temperature ultrasonic measurementsH. Watanabe, T. Goto, H. Yamada-Kaneta, Y. Nemoto, M. Hikin, T. Yanagisawa, S. NakamuraProceeding of the forum on the science and technology of silicon materials 2007 141 - 142 2007/11 [Not refereed][Not invited]
- Lei Shu, D. E. MacLaughlin, Y. Aoki, Y. Tunashima, Y. Yonezawa, S. Sanada, D. Kikuchi, H. Sato, R. H. Heffner, W. Higemoto, K. Ohishi, T. U. Ito, O. O. Bernal, A. D. Hillier, R. Kadono, A. Koda, K. Ishida, H. Sugawara, N. A. Frederick, W. M. Yuhasz, T. A. Sayles, T. Yanagisawa, M. B. MaplePHYSICAL REVIEW B 76 (1) 1098-0121 2007/07 [Refereed][Not invited]
Zero- and longitudinal-field muon spin relaxation experiments have been carried out in the alloy series Pr(Os1-xRux)(4)Sb-12 and Pr1-yLayOs4Sb12 to elucidate the anomalous dynamic muon spin relaxation observed in these materials. The damping rate Lambda associated with this relaxation varies with temperature, applied magnetic field, and dopant concentrations x and y in a manner consistent with the "hyperfine enhancement" of Pr-141 nuclear spins first discussed by Bleaney [Physica (Utrecht) 69, 317 (1973)]. This mechanism arises from Van Vleck-like admixture of magnetic Pr3+ crystalline-electric-field-split excited states into the nonmagnetic singlet ground state by the nuclear hyperfine coupling, thereby increasing the strengths of spin-spin interactions between Pr-141 and muon spins and within the Pr-141 spin system. We find qualitative agreement with this scenario and conclude that electronic spin fluctuations are not directly involved in the dynamic muon spin relaxation. - Tatsuya Yanagisawa, William M. Yuhasz, Pei-Chun Ho, M. Brian Maple, Hiromu Watanabe, Takafumi Ueno, Yuichi Nemoto, Terutaka GotoJOURNAL OF MAGNETISM AND MAGNETIC MATERIALS 310 (2) 223 - 225 0304-8853 2007/03 [Refereed][Not invited]
Elastic constants of filled-skutterudite NdOs4Sb12 single crystals have been investigated by means of ultrasonic measurements. Transverse C-44 and longitudinal C-11 modes show Curie-type softening, which is proportional to the reciprocal temperature from 10K down to 0.9K. This softening can be explained in terms of the quadrupolar susceptibility modified by crystalline electric field with a Gamma(8) quartet ground state in O-h symmetry. The C-11 mode also shows a broad shoulder and a small dip around 45 and 13 K, respectively. A Debye-type frequency dependence of the anomalies in the longitudinal C-11 mode resembles an ultrasonic dispersion in PrOs4Sb12, which is expected to be due to the "rattling'' effect, a thermally activated off-center motion of the rare-earth atom in the Sb-cage. (c) 2006 Elsevier B.V. All rights reserved. - M. B. Maple, Z. Henkie, W. M. Yuhasz, P.-C. Ho, T. Yanagisawa, T. A. Sayles, N. P. Butch, J. R. Jeffries, A. PietraszkoJOURNAL OF MAGNETISM AND MAGNETIC MATERIALS 310 (2) 182 - 187 0304-8853 2007/03 [Refereed][Not invited]
Recent experiments on the Pr-based filled skutterudite arsenides and antimonides PrOs4Sb12, PrdOs(1-x)Ru(x))(4)Sb-12, Pr1-xNdxOs4Sb12, PrFe4As12, PrRu4As12, and PrOs4As12 are reviewed. The heavy fermion compound PrOs4Sb12 exhibits unconventional strong-coupling superconductivity below T-c = 1.85K that breaks time reversal symmetry, apparently consists of several distinct superconducting phases, and may involve triplet spin pairing of electrons. Studies of the alloy systems PrdOs(1-x)Ru(x))(4)Sb-12 and Pr1-xNdxOs4Sb12 revealed rich T-x phase diagrams and a strong suppression of the high field ordered phase and the unconventional superconductivity of PrOs4Sb12 with Ru substitution. Among the three Pr-based filled skutterudite arsenides, PrFe4As12 has a ferromagnetic ground state, PrRu4As12 exhibits conventional BCS superconductivity, and PrOs4As12 is an antiferromagnet. (c) 2006 Elsevier B.V. All rights reserved. - W. M. Yuhasz, P- C. Ho, T. A. Sayles, T. Yanagisawa, N. A. Frederick, M. B. Maple, P. Rogl, G. GiesterJOURNAL OF PHYSICS-CONDENSED MATTER 19 (7) 0953-8984 2007/02 [Refereed][Not invited]
The filled skutterudite compound PrOs4P12 was synthesized in single-crystal form using a molten metal flux growth technique. Low-temperature magnetization, specific heat, and electrical resistivity measurements showed no indication of a phase transition down to 0.1 K but had features indicative of crystalline electric field (CEF) effects. Analyses of these features in terms of a cubic CEF suggest a Gamma(1) singlet or a Gamma(3) doublet ground state separated by 30-50 K from a Gamma(5) triplet first excited state. - Terutaka Goto, Yuichi Nemoto, Takashi Yamaguchi, Tatsuya Yanagisawa, Takafumi Ueno, Tomoyuki Watanabe, Naoya Takeda, Osamu Suzuki, Hideaki Kitazawa, Hitoshi Sugawara, Hideyuki SatoPHYSICA B-CONDENSED MATTER 383 (1) 115 - 119 0921-4526 2006/08 [Refereed][Not invited]
We have investigated an off-center local oscillator of a guest atom in cage of clathrate compounds R3Pd20Ge6 (R = La, Ce, Pr, Nd) and a filled skutterudite PrOs4Sb12 using ultrasonic measurements. The observation of ultrasonic dispersions in transverse C-44 mode of R3Pd20Ge6 and in transverse (C-11 - C-12)/2 mode of PrOs4Sb12 revealed the rattling of the off-center oscillator characterized by a relaxation time with Arrhenius-type temperature dependence. A low-temperature softening of C-44 in La3Pd20Ge6 below 3 K down to 20 mK and a softening of (C-11 - C-12)/2 in PrOs4Sb12 above the heavy Fermion superconducting transition indicate the charge fluctuation due to the degenerate off-center oscillators. (c) 2006 Elsevier B.V. All rights reserved. - M. B. Maple, N. A. Frederick, P. -C. Ho, W. M. Yuhasz, T. YanagisawaJOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM 19 (3-5) 299 - 315 1557-1939 2006/07 [Refereed][Not invited]
Research carried out during the last several years on the heavy fermion superconductor PrOs4Sb12 is reviewed. The compound PrOs4Sb12 exhibits unconventional strong coupling superconductivity below a superconducting critical temperature T-c = 1.85 K. The superconducting state breaks time reversal symmetry, apparently consists of several distinct superconducting phases, some of which may have point nodes in the energy gap, and may involve triplet spin pairing of electrons. The determination of the Pr3+ energy level scheme in the crystalline electric field, as well as the discovery and characterization of the high field-ordered phase (HFOP), which has been identified with antiferroquadrupolar order, are described. Studies of the substitutional systems Pr(Os1-xRux)(4)Sb-12, Pr1-xLaxOs4Sb12, and Pr1-xNdxOs4Sb12 are summarized and compared. - MB Maple, NP Butch, NA Frederick, PC Ho, Jeffries, JR, TA Sayles, T Yanagisawa, WM Yuhasz, SX Chi, HJ Kang, JW Lynn, PC Dai, SK McCall, MW McElfresh, MJ Fluss, Z Henkie, A PietraszkoPROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 103 (18) 6783 - 6789 0027-8424 2006/05 [Refereed][Not invited]
Electrical resistivity, specific heat, and magnetization measurements to temperatures as low as 80 mK and magnetic fields up to 16 T were made on the filled skutterudite compound PrOs4As12. The measurements reveal the presence of two ordered phases at temperatures below approximately 2.3 K and in fields below approximately 3 T. Neutron-scattering experiments in zero field establish an antiferromagnetic ground state < 2.28 K. In the antiferromagnetically ordered state, the electronic-specific heat coefficient y approximate to 1 J/mol-K-2 below 1.6 K and 0 <= H <= 1.25 T. The temperature and magnetic-field dependence of the electrical resistivity and specific heat in the paramagnetic state are consistent with single-ion Kondo behavior with a low Kondo temperature on the order of 1 K. The electronic-specific heat in the paramagnetic state can be described by the resonance-level model with a large zero-temperature electronic-specific heat coefficient that decreases with increasing magnetic field from approximately 1 J/mol(.)K(2) at 3 T to approximately 0.2 J/mol(.)K(2) at 16 T. - Yuichi Nemoto, Takafumi Ueno, Naoya Takeda, Takashi Yamaguchi, Tatsuya Yanagisawa, Terutaka Goto, Hitoshi Sugawara, Hideyuki SatoPHYSICA B-CONDENSED MATTER 378-80 184 - 186 0921-4526 2006/05 [Refereed][Not invited]
Ultrasonic attenuation measurements have been firstly performed for a large single crystal of PrOs4Sb12 with the dimensions of 5.97 x 0.6 x 0.6 mm(3). Remarkable frequency dependence around 20-40K has been observed in the elastic constant and attenuation coefficient of the longitudinal C-11 mode associated with E-g symmetry strain in part, which results from a thermally activated off-center rattling with E-g symmetry of a Pr ion inside a Sb icosahedron cage. Parameters of a characteristic time tau(0) = 3.1 x 10(-11) s and an activation energy E = 225 K were obtained. This E-g rattling involving a local charge fluctuation inside a Sb cage periodically arranged may couple to the conduction electrons. As a result, the electron-phonon coupling would lead to heavy fermion and its superconductivity in PrOs4Sb12. (c) 2006 Elsevier B.V. All rights reserved. - WM Yuhasz, NP Butch, TA Sayles, PC Ho, Jeffries, JR, T Yanagisawa, NA Frederick, MB Maple, Z Henkie, A Pietraszko, SK McCall, MW McElfresh, MJ FlussPHYSICAL REVIEW B 73 (14) 2469-9950 2006/04 [Refereed][Not invited]
Magnetization, specific heat, and electrical resistivity measurements were made on single crystals of the filled skutterudite compound PrOs4As12. Specific heat measurements indicate an electronic specific heat coefficient gamma similar to 50-200 mJ/mol K-2 at temperatures 10 K <= T <= 18 K, and similar to 1 J/mol K-2 for T <= 1.6 K. The combined measurements reveal the presence of two, or possibly three, ordered phases at temperatures below similar to 2.3 K and in fields below similar to 3 T. The low temperature phase displays antiferromagnetic characteristics, while the nature of the ordering in the other phase(s) has yet to be determined. - Yuhasz, W.M., Butch, N.P., Sayles, T.A., Ho, P.-C., Jeffries, J.R., Yanagisawa, T., Frederick, N.A., Maple, M.B., Henkie, Z., Pietraszko, A., McCall, S.K., McElfresh, M.W., Fluss, M.J.Physical Review B - Condensed Matter and Materials Physics 73 (14) 1098-0121 2006/04 [Refereed][Not invited]
Magnetization, specific heat, and electrical resistivity measurements were made on single crystals of the filled skutterudite compound Pr Os4 As12. Specific heat measurements indicate an electronic specific heat coefficient γ∼50-200 mJ mol K2 at temperatures 10 K≤T≤18 K, and ∼1 J mol K2 for T≤1.6 K. The combined measurements reveal the presence of two, or possibly three, ordered phases at temperatures below ∼2.3 K and in fields below ∼3 T. The low temperature phase displays antiferromagnetic characteristics, while the nature of the ordering in the other phase(s) has yet to be determined. © 2006 The American Physical Society. - R Watanuki, G Sato, K Suzuki, M Ishihara, T Yanagisawa, Y Nemoto, T GotoJOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 74 (8) 2169 - 2172 0031-9015 2005/08 [Refereed][Not invited]
Physical properties of DyB4 have been studied by magnetization, specific heat, and ultrasonic measurements. The magnetic entropy change and ultrasonic properties in intermediate phase 11 indicate that the degeneracy of internal degrees of freedom is not fully lifted in spite of the formation of magnetic order. The ultrasonic attenuation and huge softening Of C-44 in phase 11 suggest the existence of electric-quadrupolar (orbital) fluctuations of 4f-electrons. These unusual properties originate from a geometrical quadrupolar frustration. - T Yanagisawa, T Moriwaki, Y Nemoto, T Goto, R Watanuki, K SuzukiJOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 74 (6) 1666 - 1669 0031-9015 2005/06 [Refereed][Not invited]
We have performed dilatometric measurements by the capacitance method on tetragonal rare earth compounds DyB2C2 and HoB2C2 that show anti ferro-quadrupole (AFQ) ordering. The tetragonal structure is invariant across the paramagnetic phase to the AFQ phase at T-Q = 24.7 K in DyB2C2. In the case of intermediate phase IV of HoB2C2, between T-C1, = 5.9 K and T-C2 = 5.0 K, the lattice length along the [101] direction reveals an abrupt increase, while the lengths along the [100] and [110] directions shrink slightly. This lattice distortion is described in terms of triclinic strain epsilon(yz) = epsilon(zx) not equal 0 indicating the spontaneous ferro-quadrupole moment < O-yz > = < O-zx > not equal 0. A plausible model, based on an octupole ordering < T-x > = < T-y > = < T-z > not equal 0, in phase IV of HoB2C2, is argued. - T Yanagisawa, T Goto, Y Nemoto, R Watanuki, K Suzuki, O Suzuki, G KidoPHYSICA B-CONDENSED MATTER 359 959 - 961 0921-4526 2005/04 [Refereed][Not invited]
Elastic properties of tetragonal HoB2C2 showing anti ferro-quadrupole (AFQ) ordering have been investigated by means of ultrasonic measurements. An anisotropic RKKY interaction would be responsible for the AFQ phase II of HoB2C2, which has an anisotropic field-temperature (H-T) phase diagram. We succeeded in obtaining the H T phase diagram for H parallel to [001] by using a hybrid magnet up to 30 T in NIMS, and found the presence of AFQ phase II over 4 T for H parallel to [001] in HoB2C2. The critical magnetic field H-C[001] = 26.3 T suggests a distinct stability of AFQ phase II in fields along the principal axis by contrast with relatively unstable behavior under fields H-C[110] = 3.9 T and H-C[100] = 2.0 T in basal plane. (c) 2005 Elsevier B.V. All rights reserved. - T Goto, Y Nemoto, K Sakai, K Onuki, T Yamaguchi, M Akatsu, T Yanagisawa, H Sugawara, H SatoPHYSICA B-CONDENSED MATTER 359 822 - 826 0921-4526 2005/04 [Refereed][Not invited]
We have made ultrasonic measurements on a filled skutterudite PrOs4Sb12 showing a heavy Fermion superconductivity at T-C = 1.85 K. The elastic constants (C-11 - C-12)/2 and C-44 of PrOs4Sb12 exhibit low-temperature softenings below 20 K down to T-C, indicating a quadrupole fluctuation of Pr3+ ion. A minimum of (C-11 - C-12)/2 in magnetic fields along the [1 1 0] direction around 8 T shows a level crossing of one of a excited Gamma(4)((2)) triplet to a ground state Gamma(1) singlet. An ultrasonic dispersion in (C-11 - C-12)/2 around 30 K suggests a thermally activated off-center rattling of Pr ion in a cage of Sb-icosahedron. The observed relaxation time shows the Arrhenius-type temperature dependence tau = tau(0) exp(E/k(B)T) with an attempt time tau(0) = 8.8 x 10(-11) s and an activation energy E = 168 K. The charge fluctuation of the off-center motion and the quadrupole fluctuation of the 4f electron may participate in the formation of the heavy fermion and the superconductivity in PrOs4Sb12. (c) 2005 Elsevier B.V. All rights reserved. - T Yamaguchi, Y Nemotoa, T Goto, M Akatsu, T Yanagisawa, O Suzuki, H Kitazawa, T KomatsubaraPHYSICA B-CONDENSED MATTER 359 296 - 298 0921-4526 2005/04 [Refereed][Not invited]
We have made ultrasonic measurements on clathrate crystals Ce3Pd20Ge6 and La3Pd20Ge6 with a cage filled by a rare-earth atom. The elastic constants C-44 of both compounds show a marked dependence in ultrasonic frequencies of 10-300 MHz around 10-30 K, which are caused by a thermally activated rattling of the off-center rare-earth ion in the cage over the potential hill. At low temperatures below 3 K down to 20 mK, C-44 of La3Pd20Ge6 without 4f-electron exhibits a softening proportional to 1/T, which indicates a tunneling of the off-center rare-earth ion in the cage through the potential hill. (c) 2005 Elsevier B.V. All rights reserved. - T Yanagisawa, T Goto, Y Nemoto, R Watanuki, K Suzuki, O Suzuki, G KidoPHYSICAL REVIEW B 71 (10) 2469-9950 2005/03 [Refereed][Not invited]
The magnetic phase diagram for antiferroquadrupole (AFQ) ordering in tetragonal HoB2C2 has been investigated by measurements of elastic constants C-11, C-44, and C-66 in fields along the basal x-y plane as well as the principal [001]-axis. The hybrid magnet (GAMA) in Tsukuba Magnetic Laboratory was employed for high field measurements up to 30 T. The AFQ phase is no longer observed above 26.3 T along the principal [001]-axis in contrast to the relatively small critical field of 3.9 T in fields applied along the basal [110]-axis. The quadrupolar intersite interaction of O-xy and/or O-2(2) is consistent with the anisotropy in the magnetic phase diagram of the AFQ phase in HoB2C2. - Tatsuya Yanagisawa, Terutaka Goto, Yuichi Nemoto, Ryuta Watanuki, Kazuya Suzuki, Osamu Suzuki, Giyuu KidoPhysical Review B - Condensed Matter and Materials Physics 71 1098-0121 2005/01/20 [Refereed][Not invited]
The magnetic phase diagram for antiferro-quadrupole (AFQ) ordering in tetragonal HoB$_2$C$_2$ has been investigated by measurements of elastic constants $C_{11}$, $C_{44}$ and $C_{66}$ in fields along the basal $x$-$y$ plane as well as the principal [001]-axis. The hybrid magnet (GAMA) in Tsukuba Magnetic Laboratory was employed for high field measurements up to 30 T. The AFQ phase is no longer observed above 26.3 T along the principal [001] axis in contrast to the relatively small critical field of 3.9 T in fields applied along the basal [110] axis. The quadrupolar intersite interaction of $O_{xy}$ and/or $O_2^2$ is consistent with the anisotropy in the magnetic phase diagram of the AFQ phase in HoB$_2$C$_2$. - T Goto, Y Nemoto, K Onuki, K Sakai, T Yamaguchi, M Akatsu, T Yanagisawa, H Sugawara, H SatoJOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 74 (1) 263 - 266 0031-9015 2005/01 [Refereed][Not invited]
We have made ultrasonic measurements on a filled skutterudite PrOs4Sb12 showing a heavy fermion superconductivity at T-C = 1.85 K. The softening of the elastic constant with decreasing temperature has been found above T-C. The (C-11 - C-12)/2 in applying magnetic fields along the [110] axis at 1.0 K exhibits a minimum around 8 T, which is well accounted for by the one-ion quadrupolar susceptibility reflecting the level crossing of one of an excited Gamma(4)((2)) triplet to a ground state Gamma(1) singlet. The softening of (C-11 - C-12)/2 proportional to reciprocal temperature just above T-C may be dominated by the tunneling of an off-center Pr-ion in an Sb-icosahedron cage. - Terutaka Goto, Yuichi Nemoto, Takashi Yamaguchi, Mitsuhiro Akatsu, Tatsuya Yanagisawa, Osamu Suzuki, Hideaki KitazawaPHYSICAL REVIEW B - Condensed Matter and Materials Physics 70 184126 2004/09/17 [Refereed][Not invited]
We present tunneling and rattling motions of an off-center guest atom in cage referring to a clathrate crystal La_3Pd_{20}Ge_6. The elastic constant C_{44} of La_3Pd_{20}Ge_6 shows a Debye-type dispersion around 20 K obeying a relaxation time tau = tau_0exp(E/k_{B}T) with an attempt time tau_0 = 2.0*10^{-12} sec and an activation energy E = 197 K. At low temperatures below 3 K down to 20 mK, the C_{44} shows a softening of C_{44} = C_{44}^0(T-T_C^0)/(T-Theta) with T_C^0 = -337.970 mK and Theta = -338.044 mK. These facts are attributed to two different types of the off-center motions with Gamma_5 symmetry in 4a-site cage of La_3Pd_{20}Ge_6, a thermally activated rattling motion over the potential hill and a tunneling motion through the potential hill at low temperatures. - T Goto, Y Nemoto, K Sakai, T Yamaguchi, M Akatsu, T Yanagisawa, H Hazama, K Onuki, H Sugawara, H SatoPHYSICAL REVIEW B 69 (18) 2469-9950 2004/05 [Refereed][Not invited]
The elastic properties of a filled skutterudite PrOs4Sb12 with a heavy fermion superconductivity at T-C=1.85 K have been investigated. The elastic softening of (C-11-C-12)/2 and C-44 with lowering temperature down to T-C indicates that the quadrupolar fluctuation due to the CEF state plays a role for the Cooper paring in superconducting phase of PrOs4Sb12. A Debye-type dispersion in the elastic constants around 30 K revealed a thermally activated Gamma(23) rattling due to the off-center Pr-atom motion obeying tau=tau(0) exp(E/k(B)T) with an attempt time tau(0)=8.8x10(-11) s and an activation energy E=168 K. It is remarkable that the charge fluctuation of the off-center motion with Gamma(23) symmetry may mix with the quadrupolar fluctuation and enhance the elastic softening of (C-11-C-12)/2 just above T-C. - Terutaka Goto, Yuichi Nemoto, Kazuhiro Sakai, Takashi Yamaguchi, Mitsuhiro Akatsu, Tatsuya Yanagisawa, Hirofumi Hazama, Kei Onuki, Hitoshi Sugawara, Hideyuki SatoPhysical Review B - Condensed Matter and Materials Physics 69 0163-1829 2004/04/08 [Refereed][Not invited]
The elastic properties of a filled skutterudite PrOs_4Sb_{12} with a heavy Fermion superconductivity at T_C=1.85 K have been investigated. The elastic softening of (C_{11}-C_{12})/2 and C_{44} with lowering temperature down to T_C indicates that the quadrupolar fluctuation due to the CEF state plays a role for the Cooper paring in superconducting phase of PrOs_4Sb_{12}. A Debye-type dispersion in the elastic constants around 30 K revealed a thermally activated Gamma_{23} rattling due to the off-center Pr-atom motion obeying tau=tau_{0}exp(E/k_{B}T) with an attempt time tau_0=8.8*10^{-11} sec and an activation energy E=168 K. It is remarkable that the charge fluctuation of the off-center motion with Gamma_{23} symmetry may mix with the quadrupolar fluctuation and enhance the elastic softening of (C_{11}-C_{12})/2 just above T_C. - Yamaguchi T, Nemoto Y, Akatsu M, Yanagisawa T, Goto T, Suzuki O, Kitazawa H, Kido GMeeting abstracts of the Physical Society of Japan 社団法人日本物理学会 59 (1) 1 - 5 1342-8349 2004/03/03 [Not refereed][Not invited]
We present tunneling and rattling motions of an off-center guest atom in cage
referring to a clathrate crystal La_3Pd_{20}Ge_6. The elastic constant C_{44}
of La_3Pd_{20}Ge_6 shows a Debye-type dispersion around 20 K obeying a
relaxation time tau = tau_0exp(E/k_{B}T) with an attempt time tau_0 =
2.0*10^{-12} sec and an activation energy E = 197 K. At low temperatures below
3 K down to 20 mK, the C_{44} shows a softening of C_{44} =
C_{44}^0(T-T_C^0)/(T-Theta) with T_C^0 = -337.970 mK and Theta = -338.044 mK.
These facts are attributed to two different types of the off-center motions
with Ga... - Y Nemoto, T Yamaguchi, T Horino, M Akatsu, T Yanagisawa, T Goto, O Suzuki, A Donni, T KomatsubaraPHYSICAL REVIEW B 68 (18) 2469-9950 2003/11 [Refereed][Not invited]
Lattice effects in a cerium based clathrate compound Ce3Pd20Ge6 with a cubic Cr23C6-type structure have been investigated by ultrasonic and thermal expansion measurements. Elastic softenings of (C-11-C-12)/2 and C-44 proportional to the reciprocal temperature 1/T above T-Q1=1.25 K are well described in terms of the quadrupole susceptibility for the ground state Gamma(8) quartet. A huge softening of 50% in (C-11-C-12)/2 and a spontaneous expansion DeltaL/L=1.9x10(-4) along the [001] direction in particular indicate the ferroquadrupole ordering of O-2(0) below T-Q1. The elastic anomalies associated with the antiferromagnetic ordering at T-N2=0.75 K and the incommensurate antiferromagnetic ordering are also found. Notable frequency dependence of C-44 around 10 K is accounted for by the Debye-type dispersion indicating a Gamma(5) rattling motion of an off-center Ce ion along the [111] direction with eight fractionally occupied positions around the 4a site in a cage. The thermally activated Gamma(5) rattling motion obeying a relaxation time tau=tau(0) exp (E/k(B)T) with an attempt time tau(0)=3.1x10(-11) sec and an activation energy E=70 K dies out with decreasing temperature, and then the off-center tunneling state of Ce ion in the 4a-site cage will appear at low temperatures. - Yuichi Nemoto, Takashi Yamaguchi, Takenobu Horino, Mitsuhiro Akatsu, Tatsuya Yanagisawa, Terutaka Goto, Osamu Suzuki, Andreas Donni, Takemi KomatsubaraPhysical Review B - Condensed Matter and Materials Physics 68 1098-0121 2003/10/23 [Refereed][Not invited]
Lattice effects in a cerium based clathrate compound Ce_3Pd_20Ge_6 with a cubic Cr_23C_6-type structure have been investigated by ultrasonic and thermal expansion measurements. Elastic softenings of (C_11-C_12)/2 and C_44 proportional to the reciprocal temperature 1/T above T_Q1 = 1.25 K are well described in terms of the quadrupole susceptibility for the ground state Gamma_8 quartet. A huge softening of 50 % in (C_11-C_12)/2 and a spontaneous expansion DL/L = 1.9x10^-4 along the [001] direction in particular indicate the ferroquadrupole ordering of O_2^0 below T_Q1. The elastic anomalies associated with the antiferromagnetic ordering at T_N2 = 0.75 K and the incommensurate antiferromagnetic ordering are also found. Notable frequency dependence of C_44 around 10 K is accounted for by the Debye-type dispersion indicating a Gamma_5 rattling motion of an off-center Ce ion along the [111] direction with eight fractionally occupied positions around the 4a site in a cage. The thermally activated Gamma_5 rattling motion obeying a relaxation time t = t_0exp(E/k_BT) with an attempt time t_0 = 3.1x10^-11 sec and an activation energy E = 70 K dies out with decreasing temperature, and then the off-center tunneling state of Ce ion in the 4a-site cage will appear at low temperatures. - T Goto, M Akatsu, T Yanagisawa, T Yamaguchi, Y Nemoto, O Suzuki, S Nakamura, S Kunii, R Watanuki, K SuzukiJOURNAL OF PHYSICS-CONDENSED MATTER 15 (28) S2101 - S2107 0953-8984 2003/07 [Refereed][Not invited]
The quadrupole orderings and lattice effects in 4f-electron systems with orbital degeneracy in rare earth compounds have been investigated by ultrasonic and thermal expansion measurements. A ferroquadrupole (FQ) O-xy-type ordering associated with a trigonal distortion in HoB6 with a Gamma(5) ground state is presented. The trigonal distortion in ordered phase IV CexLa1-xB6 (x = 0.75 and 0.70) with a Gamma(8) ground state indicates O-xy-type FQ ordering in phase IV. In both systems, HoB6 and CexLa1-xB6, C-44 anomalies are observed. In tetragonal HoB2C2, an ordered phase IV appears near a tetra-critical point, where the antiferroquadrupole phase II and antiferromagnetic phase III compete with each other. Noticeable ultrasonic attenuation and softening of elastic constants in phase IV of HoB2C2 due to quadrupole fluctuation with a slow relaxation time tau similar to 7 x 10(-9) s are found. - Y Nemoto, T Yanagisawa, K Hyodo, T Goto, S Miyata, R Watanuki, K SuzukiPHYSICA B-CONDENSED MATTER 329 641 - 642 0921-4526 2003/05 [Refereed][Not invited]
Elastic constants of tetragonal system DyB2C2 with antiferro-quadrupole (AFQ) ordering have been measured by using ultrasonic method. Remarkable elastic softenings of the C-44 and (C-11 - C-12)/2 have been observed towards the AFQ transition at T-Q = 25 K. The present results show that a CEF ground state is a pseudo-quartet consisting of two Kramers doublets of E-1/2 and E-3/2 in C-4h site symmetry of Dy3+ ion. The dominant softening Of C-44 probably leads to the order parameter of O-yz and O-zx in AFQ phase. Magnetic phase diagram applied fields along the [100] direction determined by field dependence of the C-44 is presented. (C) 2003 Elsevier Science B.V. All rights reserved. - T Yanagisawa, Y Nemoto, T Goto, S Miyata, R Watanuki, K SuzukiPHYSICA B-CONDENSED MATTER 329 624 - 625 0921-4526 2003/05 [Refereed][Not invited]
Elastic properties of the ternary rare earth compound HoB2C2 with a tetragonal symmetry have been investigated by means of ultrasonic measurements. The elastic constants Of C-44, C-66 and (C-11 - C-12)/2 exhibit the characteristic softening below about 40 K. In order to analyze quadrupole susceptibility, we assume a pseudo-degeneracy model consisting of a ground state E-doublet and an excited state A- or B-singlet at energy Deltasimilar to5.0 K. The considerable softening of the elastic constant and ultrasonic attenuation in phase IV between T-C1 = 5.9 K and T-C2 = 5.0 K have been found. The slow relaxation rate of 7 x 10(-9) s suggests that the fluctuation of quadrupole moments is enhanced in phase IV. We also show a H-T phase diagram of HoB2C2 under magnetic fields along [100]. (C) 2003 Elsevier Science B.V. All rights reserved. - T Yanagisawa, T Goto, Y Nemoto, S Miyata, R Watanuki, K SuzukiPHYSICAL REVIEW B 67 (11) 2469-9950 2003/03 [Refereed][Not invited]
The elastic properties of HoB2C2 undergoing an antiferroquadrupole ordering with a tetragonal structure have been investigated by means of ultrasonic measurements. The transverse (C-11-C-12)/2, C-44, and C-66 modes exhibit characteristic softenings with decreasing temperature in a paramagnetic phase I down to an ordered phase IV at T-C1=5.9 K. The softening of (C-11-C-12)/2, C-44 and C-66 is described by a formula C-Gamma=C-Gamma(0)(T-T-C(0))/(T-Theta) due to the quadrupole-strain interaction for the 4f state of HoB2C2 consisting of a ground E doublet with orbital degeneracy and an excited singlet with a small-energy splitting Delta. The significant softening of the elastic constant and the ultrasonic attenuation in phase IV between T-C1=5.9 K and T-C2=5.0 K have been found. The ultrasonic dispersion in phase IV indicates the slowing down of the quadrupole fluctuation time, tau=7x10(-9) sec. - Yanagisawa, T., Goto, T., Nemoto, Y., Miyata, S., Watanuki, R., Suzuki, K.Physical Review B - Condensed Matter and Materials Physics 67 (11) 1151291 - 1151298 0163-1829 2003/03 [Refereed][Not invited]
The elastic properties of HoB2C2 undergoing an antiferroquadrupole ordering with a tetragonal structure have been investigated by means of ultrasonic measurements. The transverse (C 11 -C 12 )/2, C 44 , and C 66 modes exhibit characteristic softenings with decreasing temperature in a paramagnetic phase I down to an ordered phase IV at T C? = 5.9 K. The softening of of (C 11 -C 12 )/2, C 44 and C 66 is described by a formula CΓ = C Γ 0 (T-T C 0 )(T-Θ) due to the quadrupole-strain interaction for the 4f state of HoB 2 C 2 consisting of a ground E doublet with orbital degeneracy and an excited singlet with a small-energy splitting Δ. The significant softening of the elastic constant and the ultrasonic attenuation in phase IV between T C1 = 5.9 K and T C2 = 5.0 K have been found. The ultrasonic dispersion in phase IV indicates the slowing down of the quadrupole fluctuation time, τ = 7 × 10 -9 sec. - T Goto, T Yanagisawa, K Hyodo, Y Nemoto, S Miyata, R Watanuki, K SuzukiACTA PHYSICA POLONICA B 34 (2) 1173 - 1176 0587-4254 2003/02 [Refereed][Not invited]
The antiferroquadrupole orderings of the ternary rare earth compounds HoB2C2 and DyB2C2 have been investigated by means of ultrasonic measurements. The transverse (C-11-C-12)/2, C-44, C-66 modes in HoB2C2 exhibit characteristic softening above T-c2 = 5.0 K, which consist with an E-doublet and a singlet for the ground state. Considerable elastic softening and ultrasonic attenuation in phase IV below T-c1 = 5.9 K of HoB2C2 indicates an enhancement of the quadrupole fluctuation with a relaxation rate tau = 7 x 10(-9) sec. A softening of the transverse elastic constant C-44 in DyB2C2 above T-Q = 24.7 K indicates accidentally degenerated Kramers doublets of E-1/2 and E-3/2 for the ground state. - Tatsuya Yanagisawa, Terutaka Goto, Yuichi Nemoto, Shingo Miyata, Ryuta Watanuki, Kazuya SuzukiPhysical Review B - Condensed Matter and Materials Physics 67 (11) 8 1550-235X 2003 [Refereed][Not invited]
The elastic properties of (formula presented) undergoing an antiferroquadrupole ordering with a tetragonal structure have been investigated by means of ultrasonic measurements. The transverse (formula presented) (formula presented) and (formula presented) modes exhibit characteristic softenings with decreasing temperature in a paramagnetic phase I down to an ordered phase IV at (formula presented) The softening of (formula presented) (formula presented) and (formula presented) is described by a formula (formula presented) due to the quadrupole-strain interaction for the (formula presented) state of (formula presented) consisting of a ground E doublet with orbital degeneracy and an excited singlet with a small-energy splitting (formula presented) The significant softening of the elastic constant and the ultrasonic attenuation in phase IV between (formula presented) and (formula presented) have been found. The ultrasonic dispersion in phase IV indicates the slowing down of the quadrupole fluctuation time, (formula presented). © 2003 The American Physical Society. - Goto, T., Yanagisawa, T., Nemoto, Y., Miyata, S., Watanuki, R., Suzuki, K.Journal of the Physical Society of Japan 71 (SUPPL.) 88 - 90 0031-9015 2002/12 [Refereed][Not invited]
We have investigated the elastic constants of the ternary rare earth compound H0B 2 C 2 with a tetragonal structure by means of the ultrasonic method. The elastic constants of (C 11-C 12 )/2, C 44 and C 66 , corresponding to the transverse ultrasonic modes exhibit the softening proportional to reciprocal temperature below about 40 K. This softening is commonly enhanced in the ordered phase IV below T c1 =5.9 k. An abrupt increase of elastic constants is found in the ordered phase III below T c2 =5.0 k characterized by the simultaneous antiferro-type ordering of electric quadrupole and magnetic dipole moments. The quadrupole susceptibility based on a model consisting of a ground state E-doublet and an excited singlet with a low energy in H0B 2 C 2 is employed for the analysis of the softening above T c1 =5.9 K. The enhancement of the elastic softening in the phase IV of H0B 2 C 2 resembles to the soft C 44 mode in the phase IV in Ce o.75 La o.25 B 6 . © 2002 The Physical Society of Japan. - Yanagisawa, T., Nemoto, Y., Goto, T., Onuki, Y.Journal of the Physical Society of Japan 71 (SUPPL.) 267 - 269 0031-9015 2002/12 [Refereed][Not invited]
We have performed low-temperature ultrasonic measurements on CeRu 2 Si 2 by using a dilution refrigerator down to 20 mK with a superconducting magnet up to 16 T. The longitudinal modes exhibit huge softening of 20% around a metamagnetic transition point Hc∼7.7 T, while the transverse modes show softening of about 1%. This result suggests that the coupling of the volume strain b to the order parameter with total symmetry plays a crucial role for the metamagnetic transition in CeRu 2 Si 2 . In the vicinity of H c , the enormous ultrasonic attenuation has been observed in the longitudinal ultrasonic modes. The relaxation time r increases considerably near the metamagnetic transition due to a critical slowing-down. We also show the detailed magnetic phase diagram of CeRu 2 Si 2 down to 20 mK around H c © 2002 The Physical Society of Japan. - T Yanagisawa, Y Nemoto, T Goto, Y OnukiPHYSICA B-CONDENSED MATTER 312 271 - 273 0921-4526 2002/03 [Refereed][Not invited]
We have performed ultrasonic measurements on CeRu2Si2 down to 20 mK in magnetic fields up to 16 T. The longitudinal C-11 and C-33 exhibit considerable softening of 20% which coincide with ultrasonic absorption around the metamagnetic point H-C = 7.7 T. The transverse C-44 and C-66 show only a small softening of approximate to 0.8 % around H-C. The softening in the longitudinal C-11 and C-33 comprising a volume strain suggests that the coupling of the order parameter with total symmetry to the volume strain plays a crucial role for the metamagnetic transition in CeRu2Si2. (C) 2002 Elsevier Science B.V. All rights reserved. - Goto Terutaka, Yanagisawa Tatsuya, Nemoto YuichiJournal of the Physical Society of Japan Physical Society of Japan 71 (0) 88 - 90 0031-9015 2002 [Refereed][Not invited]
- Yanagisawa Tatsuya, Nemoto Yuichi, Goto TerutakaJournal of the Physical Society of Japan Physical Society of Japan 71 (0) 267 - 269 0031-9015 2002 [Refereed][Not invited]
- Terutaka Goto, Tatsuya Yanagisawa, Yuichi Nemoto, Shingo Miyata, Ryuta Watanuki, Kazuya SuzukiJOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 71 88 - 90 0031-9015 2002/01 [Refereed][Not invited]
We have investigated the elastic constants of the ternary rare earth compound HoB2C2 with a tetragonal structure, by means of the ultrasonic method. The elastic constants of (C-11- C-12)/2, C-44 and C-66,, corresponding to the transverse ultrasonic modes exhibit the softening proportional to reciprocal temperature below about 40 K. This softening is commonly enhanced in the ordered phase IV below T-C1 = 5.9 K. An abrupt increase of elastic constants is found in the ordered phase UI below T-C2 = 5,0 K characterized by the simultaneous antiferro-type ordering of electric quadrupole and magnetic dipole moments. The quadrupole susceptibility based on a model consisting of a ground state E-doublet and an excited singlet with a low energy in HoB2C2 is employed for the analysis of the softening above T-C1 = 5.9 K. The enhancement of the elastic softening in the phase IV of HoB2C2 resembles to the soft C44 mode in the phase IV in Ce0,751La0.25B6. - Yanagisawa, Tatsuya, Nemoto, Yuichi, Goto, Terutaka, Onuki, YoshichikaJOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 71 267 - 269 0031-9015 2002/01 [Refereed][Not invited]
We have performed low-temperature ultrasonic measurements on CeRu2Si2 by using a dilution refrigerator down to 20 niK with a superconducting magnet up to 16 T. The longitudinal modes exhibit huge softening of 20% around a metamagnetic transition point H-C similar to 7.7 T, while the transverse modes show softening of about 1%. This result suggests that the coupling of the volume strain epsilon(B) to the order parameter with total symmetry plays a crucial role for the metamagnetic.transition in CeRu2Si2. In the vicinity of H-C, the enormous ultrasonic attenuation has been observed in the longitudinal ultrasonic modes. The relaxation time tau increases considerably near the metamagnetic transition due to a critical stowing-down. We also show the detailed magnetic phase diagram of CeRu2Si2 down to 20 mK around H-C.
MISC
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- 金子佑真, 日高宏之, 村田怜也, 早坂英海, 柳澤達也, 網塚浩, 田島聖士, 平井大悟郎, 廣井善二 日本物理学会講演概要集(CD-ROM) 76- (2) 2021
- 田端千紘, 村田怜也, 今布咲子, 早坂英海, 日比野瑠央, 金子佑真, 中尾裕則, 齋藤開, 清水悠晴, 青木大, 日高宏之, 柳澤達也, 網塚浩 日本物理学会講演概要集(CD-ROM) 76- (2) 2021
- 早坂英海, 日高宏之, 金子佑真, 柳谷駿, 柳澤達也, 網塚浩, 谷田博司 日本物理学会講演概要集(CD-ROM) 76- (1) 2021
- 今布咲子, 鈴木悠介, 高力暁成, 村田怜也, 金子佑真, 日高宏之, 柳澤達也, 田端千紘, 中尾裕則, 清水悠晴, 青木大, 網塚浩 日本物理学会講演概要集(CD-ROM) 76- (1) 2021
- 柳澤達也, 三上義人, 日高宏之, 網塚浩, 木俣基, 中村慎太郎, 淡路智 東北大学金属材料研究所強磁場超伝導材料研究センター年次報告 2020- 2021
- 中村慎太郎, 中村慎太郎, 淡路智, 柳澤達也, 松村武, 落合明, 落合明 東北大学金属材料研究所強磁場超伝導材料研究センター年次報告 2019- 2020
- 浜本諭, 浜本諭, 中田惟奈, 中田惟奈, 久我健太郎, 藤原秀紀, 藤原秀紀, 木須孝幸, 木須孝幸, 東谷篤志, 東谷篤志, 山崎篤志, 山崎篤志, 今田真, 今田真, 田中新, 玉作賢治, 矢橋牧名, 石川哲也, 日高宏之, 柳澤達也, 網塚浩, 松本圭介, 鬼丸孝博, 高畠敏郎, 関山明, 関山明 日本放射光学会年会・放射光科学合同シンポジウム(Web) 33rd- 2020
- 中村慎太郎, 中村慎太郎, 淡路智, 柳澤達也, 斎藤猛敬, 松村武, 落合明, 落合明 日本物理学会講演概要集(CD-ROM) 75- (1) 2020
- 柳澤達也, 日比野瑠央, 日高宏之, 網塚浩, ZHERLITSYN Sergei, WOSNITZA Joachim, WOSNITZA Joachim, 山根悠, 鬼丸孝博 日本物理学会講演概要集(CD-ROM) 75- (1) 2020
- 村田怜也, 今布咲子, 金子佑真, 田端千紘, 中尾裕則, 齋藤開, 清水悠晴, 青木大, 日高宏之, 柳澤達也, 網塚浩 日本物理学会講演概要集(CD-ROM) 75- (1) 2020
- 三上義人, 柳澤達也, 日比野瑠央, 日高宏之, 網塚浩, 平井大悟郎, 廣井善二 日本物理学会講演概要集(CD-ROM) 75- (1) 2020
- 日高宏之, 金子佑真, 村田怜也, 柳澤達也, 網塚浩, 田島聖士, 平井大悟郎, 廣井善二 日本物理学会講演概要集(CD-ROM) 75- (1) 2020
- 今布咲子, 鈴木悠介, 高力暁成, 山本将隆, 村田怜也, 金子佑真, 日高宏之, 柳澤達也, 田端千紘, 中尾裕則, 清水悠晴, 本間佳哉, 本多史憲, LI Dexin, 仲村愛, 青木大, 網塚浩 日本物理学会講演概要集(CD-ROM) 75- (1) 2020
- 今布咲子, 鈴木悠介, 高力暁成, 村田怜也, 金子佑真, 日高宏之, 柳澤達也, 田端千紘, 中尾裕則, 清水悠晴, 青木大, 網塚浩 KEK Progress Report (Web) (2020-6) 2020
- 村田怜也, 今布咲子, 金子佑真, 田端千紘, 中尾裕則, 齋藤開, 清水悠晴, 青木大, 日高宏之, 柳澤達也, 網塚浩 KEK Progress Report (Web) (2020-6) 2020
- 日比野瑠央, 柳澤達也, 三上義人, 日高宏之, 網塚浩, ZHERLITSYN Sergei, WOSNITZA Joachim, WOSNITZA Joachim, 山根悠, 鬼丸孝博 日本物理学会講演概要集(CD-ROM) 75- (2) 2020
- 金子佑真, 日高宏之, 村田怜也, 柳澤達也, 網塚浩, 田島聖士, 平井大悟郎, 廣井善二 日本物理学会講演概要集(CD-ROM) 75- (2) 2020
- 三上義人, 柳澤達也, 日比野瑠央, 日高宏之, 網塚浩, 平井大悟郎, 廣井善二 日本物理学会講演概要集(CD-ROM) 75- (2) 2020
- 柳澤達也, 三上義人, 日高宏之, 網塚浩, 中村慎太郎, 淡路智 東北大学金属材料研究所強磁場超伝導材料研究センター年次報告 2018- 92‐93 2019/06 [Not refereed][Not invited]
- 筒井智嗣, 清水悠晴, 日高宏之, 長谷川巧, 柳澤達也, 網塚浩 日本物理学会講演概要集(CD-ROM) 74- (1) 2019
- 山本将隆, 日高宏之, 柳澤達也, 田端千紘, 中尾裕則, 下村晋, 小野寺秀也, 網塚浩 日本物理学会講演概要集(CD-ROM) 74- (1) 2019
- 柳澤達也, 日高宏之, 網塚浩, 齋藤開, 田端千紘, GORBUNOV D., 野村肇宏, ZHERLITSYN S., WOSNITZA J., UHLIROVA K., VALISKA M., SECHOVSKY V. 日本物理学会講演概要集(CD-ROM) 74- (1) 2019
- 高力暁成, 山本将隆, 鹿内奈南, 齋藤開, 田端千紘, 日高宏之, 柳澤達也, 網塚浩, 谷田博司, 松村武, 世良正文 日本物理学会講演概要集(CD-ROM) 74- (1) 2019
- 日高宏之, 水内康太, 柳澤達也, 網塚浩 日本物理学会講演概要集(CD-ROM) 74- (1) 2019
- 村田怜也, 今布咲子, 田端千紘, 中尾裕則, 齋藤開, 清水悠晴, 青木大, 日高宏之, 柳澤達也, 網塚浩 日本物理学会講演概要集(CD-ROM) 74- (2) 2019
- 與儀護, 水内康太, 日高宏之, 清水悠晴, 柳澤達也, 網塚浩 日本物理学会講演概要集(CD-ROM) 74- (2) 2019
- 今布咲子, 鈴木悠介, 高力暁成, 山本将隆, 村田怜也, 日高宏之, 柳澤達也, 田端千紘, 中尾裕則, 清水悠晴, 本間佳哉, 本多史憲, LI Dexin, 仲村愛, 青木大, 網塚浩 日本物理学会講演概要集(CD-ROM) 74- (2) 2019
- 日高宏之, 水内康太, 柳澤達也, 網塚浩, 大原潤 日本物理学会講演概要集(CD-ROM) 74- (2) 2019
- 高力暁成, 山本将隆, 鹿内奈南, 齋藤開, 田端千紘, 日高宏之, 柳澤達也, 網塚浩, 谷田博司, 松村武, 世良正文 日本物理学会講演概要集(CD-ROM) 74- (2) 2019
- 柳澤達也, 日高宏之, 網塚浩, ZHERLITSYN Sergei, WOSNITZA Joachim, WOSNITZA Joachim, 山根悠, 鬼丸孝博 日本物理学会講演概要集(CD-ROM) 74- (2) 2019
- 中村慎太郎, 柳澤達也, 斎藤猛敬, 落合明, 壁谷典幸, 松村武, 淡路智 東北大学金属材料研究所強磁場超伝導材料研究センター年次報告 2017- 131‐133 2018/06 [Not refereed][Not invited]
- 柳澤達也, 齋藤開, 日高宏之, 網塚浩, 中村慎太郎, 淡路智 東北大学金属材料研究所強磁場超伝導材料研究センター年次報告 2017- 110‐111 2018/06 [Not refereed][Not invited]
- 柳澤達也, 齋藤開, 日高宏之, 網塚浩, 中村慎太郎, 淡路智, GORBUNOV Denis, ZHERLITSYN Sergei, WOSNITZA Jochen, UHLIROVA Klara, VALISKA Michal, SECHOVSKY Vladimir 日本物理学会講演概要集(CD-ROM) 73- (1) 2018
- 鹿内奈南, 網塚浩, 齋藤開, 山本将隆, 日高宏之, 柳澤達也, 谷田博司, 松村武, 世良正文 日本物理学会講演概要集(CD-ROM) 73- (1) 2018
- 齋藤開, 鈴木悠介, 鹿内奈南, 三浦植幸, 日高宏之, 柳澤達也, 田端千紘, 網塚浩 日本物理学会講演概要集(CD-ROM) 73- (1) 2018
- 比嘉野乃花, 久保田史洋, 上原弘敬, 與儀護, 水内康太, 日高宏之, 柳澤達也, 網塚浩 日本物理学会講演概要集(CD-ROM) 73- (1) 2018
- 日高宏之, 井原慶彦, 山崎聖悟, 三浦植幸, 柳澤達也, 網塚浩 日本物理学会講演概要集(CD-ROM) 73- (1) 2018
- 與儀護, 久保田史洋, 比嘉野乃花, 上原弘敬, 水内康太, 日高宏之, 柳澤達也, 網塚浩 日本物理学会講演概要集(CD-ROM) 73- (2) 2018
- 柳澤達也, 日高宏之, 網塚浩, 齋藤開, 田端千紘, GORBUNOV D., 野村肇宏, ZHERLITSYN S., WOSNITZA J., UHLIROVA K., VALISKA M., SECHOVSKY V. 日本物理学会講演概要集(CD-ROM) 73- (2) 2018
- 山本将隆, 日高宏之, 柳澤達也, 田端千紘, 中尾裕則, 下村晋, 小野寺秀也, 網塚浩 日本物理学会講演概要集(CD-ROM) 73- (2) 2018
- 斎藤猛敬, 松盛泰明, 日高宏之, 柳澤達也, 網塚浩, 林佑弥, 松村武, 中村慎太郎, 落合明 日本物理学会講演概要集(CD-ROM) 73- (2) 2018
- 高力暁成, 山本将隆, 鹿内奈南, 齋藤開, 田端千紘, 日高宏之, 柳澤達也, 網塚浩, 谷田博司, 松村武, 世良正文 日本物理学会講演概要集(CD-ROM) 73- (2) 2018
- 日高宏之, 山崎聖悟, 永田涼馬, 水内康太, 三浦植幸, 門別翔太, 田端千紘, 清水悠晴, 柳澤達也, 網塚浩 日本物理学会講演概要集(CD-ROM) 73- (2) 2018
- 立松愛梨, 日高宏之, 柳澤達也, 網塚浩, 仲村愛, 本間佳哉, 本多史憲, 青木大 日本物理学会講演概要集(CD-ROM) 72- (2) ROMBUNNO.21aF21‐12 2017/09/25 [Not refereed][Not invited]
- 柳澤達也, 日高宏之, 網塚浩, 中村慎太郎, 淡路智, YAZICI D, WHITE B. D, MAPLE M. B, CONG P. T, ZHERLITSYN S, WOSNITZA J 東北大学金属材料研究所強磁場超伝導材料研究センター年次報告 2016- 97‐98 2017/06 [Not refereed][Not invited]
- 齋藤開, 三浦植幸, 日高宏之, 柳澤達也, 網塚浩, 田端千紘, VALISKA Michal, UHLIROVA Klara, PLOKLESKA Jan, SECHOVSKY Vladimir 日本物理学会講演概要集(CD-ROM) 72- (1) 2017
- 日高宏之, 水内康太, 山崎聖悟, 三浦植幸, 清水悠晴, 柳澤達也, 網塚浩 日本物理学会講演概要集(CD-ROM) 72- (1) 2017
- 井原慶彦, 大沼晃弘, 山崎聖悟, 三浦植幸, 日高宏之, 柳澤達也, 網塚浩 日本物理学会講演概要集(CD-ROM) 72- (1) 2017
- 松盛泰明, 門別翔太, 齋藤開, 柳澤達也, 日高宏之, 網塚浩 日本物理学会講演概要集(CD-ROM) 72- (1) 2017
- 田端千紘, KLICPERA Milan, KLICPERA Milan, OULADDIAF Bachir, 齋藤開, VALISKA Michal, UHLIROVA Klara, SECHOVSKY Vladimir, 日高宏之, 柳澤達也, 網塚浩 日本物理学会講演概要集(CD-ROM) 72- (1) 2017
- 日高宏之, 山崎聖悟, 永田涼馬, 水内康太, 三浦植幸, 門別翔太, 田端千紘, 清水悠晴, 柳澤達也, 網塚浩 日本物理学会講演概要集(CD-ROM) 72- (2) 2017
- 柳澤達也, 松盛泰明, 斎藤猛敬, 齋藤開, 日高宏之, 網塚浩 日本物理学会講演概要集(CD-ROM) 72- (2) 2017
- 鹿内奈南, 齋藤開, 日高宏之, 柳澤達也, 網塚浩, 谷田博司, 松村武, 世良正文 日本物理学会講演概要集(CD-ROM) 72- (2) 2017
- 斎藤猛敬, 松盛泰明, 日高宏之, 柳澤達也, 網塚浩, 林佑弥, 松村武, 落合明 日本物理学会講演概要集(CD-ROM) 72- (2) 2017
- 網塚浩, 齋藤開, 柳澤達也, 日高宏之, 鹿内奈南, 立松愛梨, 田端千紘, 本間佳哉, 李徳新, 清水悠晴, 仲村愛, 本多史憲, 青木大 東北大学金属材料研究所附属量子エネルギー材料科学国際研究センター共同利用研究経過報告書(CD-ROM) 34- 104‐105 2017 [Not refereed][Not invited]
- 網塚浩, 田端千紘, 齋藤開, 柳澤達也, 日高宏之, 稲見俊哉, 青木大, 本多史憲, 本間佳哉, 仲村愛 日本物理学会講演概要集(CD-ROM) 71- (1) ROMBUNNO.19ABL‐2 -1959 2016/03/22 [Not refereed][Not invited]
- 永田涼馬, 田端千紘, 水内康太, 清水悠晴, 三浦植幸, 山崎聖悟, 門別翔太, 日高宏之, 柳澤達也, 網塚浩 日本物理学会講演概要集(CD-ROM) 71- (1) 2016
- 田端千紘, 井原慶彦, 新村省悟, 三浦植幸, 齋藤開, 日高宏之, 柳澤達也, 網塚浩 日本物理学会講演概要集(CD-ROM) 71- (1) 2016
- 柳澤達也, 門別翔太, 日高宏之, 網塚浩, CONG P. T., YASHIN S., ZHERLITSYN S., WOSNITZA J., HUANG K., KANCHANAVATEE N., JANOSCHEK M., MAPLE M. B., 青木大, 青木大 日本物理学会講演概要集(CD-ROM) 71- (1) 2016
- 松盛泰明, 酒井新, 門別翔太, 齋藤開, 柳澤達也, 日高宏之, 網塚浩 日本物理学会講演概要集(CD-ROM) 71- (2) 2016
- 三浦植幸, UHLIROVA Klara, PRCHAL Jiri, 田端千紘, SECHOVSKY Vladimir, 日高宏之, 柳澤達也, 網塚浩 日本物理学会講演概要集(CD-ROM) 71- (2) 2016
- Yanagisawa T., Kanchanavatee N., Janoschek M., Maple M. B., Aoki D., Mombetsu S., Hidaka H., Amitsuka H., Cong P. T., Yashin S., Zherlitsyn S., Wosnitza J., Huang K. Meeting Abstracts of the Physical Society of Japan 71- 1960 -1960 2016
- Tabata C., Ihara Y., Shimmura S., Miura N., Saito H., Hidaka H., Yanagisawa T., Amitsuka H. Meeting Abstracts of the Physical Society of Japan 71- 1961 -1961 2016
- Nagata R, Amitsuka H, Tabata C, Mizuuchi K, Shimizu Y, Miura N, Yamazaki S, Mombetsu S, Hidaka H, Yanagisawa T Meeting Abstracts of the Physical Society of Japan 71- (0) 2016 [Not refereed][Not invited]
- Saito H, Uenishi K, Miura N, Tabata C, Hidaka H, Yanagisawa T, Amitsuka H Meeting Abstracts of the Physical Society of Japan 71- (0) 2068 -2068 2016 [Not refereed][Not invited]
- Tabata Chihiro, Miura Naoyuki, Uhlířová Klára, Vališka Michal, Sechovský Vladimír, Saito Hiraku, Hidaka Hiroyuki, Yanagisawa Tatsuya, Amitsuka Hiroshi Meeting Abstracts of the Physical Society of Japan 71- (0) 1752 -1752 2016 [Not refereed][Not invited]
<p>UAu_2_Si_2_は約19Kで強磁性的な秩序を起こすということを除いて、その低温物性は明らかになっていなかった。最近、我々は本物質の単結晶育成に初めて成功し、詳細な基礎物性測定やNMR測定から19Kの秩序が強磁性ではなく、自発磁化を伴うが本質的には反強磁性であることを明らかにしてきた。本講演では磁気抵抗測定の結果を紹介し、輸送現象の側面から本物質の秩序に伴う磁性の変化について議論する。</p> - Miura Naoyuki, Uhlířová Klára, Prchal Jiří, Tabata Chihiro, Sechovský Vladimír, Hidaka Hiroyuki, Yanagisawa Tatsuya, Amitsuka Hiroshi Meeting Abstracts of the Physical Society of Japan 71- (0) 1755 -1755 2016 [Not refereed][Not invited]
<p>UBe_13_はエキゾチックな超伝導を示す重い電子系であり、また、転移温度以上では非フェルミ流体異常を示す。磁性希釈極限系Th_1-x_U_x_Be_13_$(x \leq 0.11)$ では通常フェルミ状態が実現することを我々は既に明らかにしているが、$x = 1$における非フェルミ状態へどのように移行するのかは自明ではない。本公演では全U濃度($0 \leq x \leq 1$)における低温物性（磁化率、電気抵抗、比熱）の実験結果を紹介し、UBe_13_における非フェルミ流体異常の起源について議論する。</p> - Hidaka Hiroyuki, Miura Naoyuki, Seguchi Taisei, Yanagisawa Tatsuya, Amitsuka Hiroshi Meeting Abstracts of the Physical Society of Japan 71- (0) 1756 -1756 2016 [Not refereed][Not invited]
<p>UBe_13_における非フェルミ流体異常の起源を探るために、Th置換系の研究を最近我々のグループで行っている。本公演ではいくつかのU濃度試料における高圧下電気抵抗測定の結果を紹介し、低温金属状態に対する置換効果と圧力効果の違いについて議論する予定である。</p> - Matsumori H, Monbetsu S, Saito H, Hidaka H, Yanagisawa T, Amitsuka H Meeting Abstracts of the Physical Society of Japan 71- (0) 1762 -1762 2016 [Not refereed][Not invited]
<p>UNi4BはT_N_＝20Kで磁気秩序を示し、その秩序は近年提唱されたトロイダル秩序の候補として注目されている。本研究ではUNi_4_Bの磁気秩序に関する電子-格子相互作用について理解を深めるため、超音波音速測定を用い、横波弾性定数C66が秩序相直上および秩序相内でソフト化する振る舞いを観測した。また、磁場中弾性定数測定により詳細な磁場―温度相図を得た。</p> - Mombetsu Shota, Inagaki Hiroyuki, Murazumi Taro, Hidaka Hiroyuki, Yanagisawa Tatsuya, Amitsuka Hiroshi, Ho Pei-Chun, Maple M. Brian Meeting Abstracts of the Physical Society of Japan 71- (0) 1819 -1819 2016 [Not refereed][Not invited]
<p>充填スクッテルダイト化合物SmOs_4_Sb_12_は従来の近藤効果では説明できない磁場に鈍感な重い電子状態を示す。また、カゴ状化合物に特徴的な局所原子振動「ラットリング」を示す。本研究では、静水圧力下における超音波測定を行い、ラットリングに起因して現れる超音波分散が圧力印加によってその特性温度を変え、低温秩序相内で観測される際、特性緩和時間が発散的に変化する振る舞いを捉えた。</p> - Takai Mashiho, Tabata Chihiro, Saito Hiraku, Hidaka Hiroyuki, Yanagisawa Tatsuya, Amitsuka Hiroshi Meeting Abstracts of the Physical Society of Japan 71- (0) 2173 -2173 2016 [Not refereed][Not invited]
<p>一般にf電子系の低温領域における電子相関を理解するためには、c-f混成の影響が弱い高温領域（弱結合領域）でのf電子の局在的性質を把握することが重要である。5f電子系においては、多くの場合、この「高温領域」は室温以上に拡がっていると考えられる。そこで、従来の室温以下ミリケルビンまでの測定に加え、1200 Kまでの測定を行う装置開発を進めている。本公演では赤外線イメージ炉を用いた高温電気抵抗測定システムの開発過程を報告する。</p> - Shimmura Shogo, Mizuuchi Kota, Seguchi Taisei, Saito Hiraku, Hidaka Hiroyuki, Yanagisawa Tatsuya, Amitsuka Hiroshi Meeting Abstracts of the Physical Society of Japan 71- (0) 2202 -2202 2016 [Not refereed][Not invited]
<p>CeCdは常圧、16.5 Kで強磁性秩序を示すことが知られている。最近、我々はこの物質の高圧下・強磁場中電気抵抗測定を行い、3dや5f電子系強磁性体だけではなく、4f電子系においても1次の量子相転移が普遍的に起こる可能性が高いことを初めて明らかにした。本講演では、さらなる高圧下物性測定の結果を紹介し、他の強磁性体や理論モデルと比較してCeCdの圧力誘起量子相転移に関する議論をさらに行う予定である。</p> - Mizuuchi K, Nagata R, Miura N, Hidaka H, Yanagisawa T, Amitsuka H Meeting Abstracts of the Physical Society of Japan 71- (0) 2271 -2271 2016 [Not refereed][Not invited]
<p>重い電子系超伝導物質として知られるUBe_13_についてはこれまで盛んに研究が行われてきたが、一方でRBe_13_(R=希土類)に関する研究は、NaZn_13_型の結晶構造やf電子の性質に由来する物性を議論する上で重要と考えられるにもかかわらず充分に行われていない。最近我々は、希土類化合物RBe_13_(R=La、Nd、Sm等)のAl-フラックス法による単結晶試料育成を行い、その基礎物性測定について報告を行ってきた。本講演では、各物質の低温における物性について議論する予定である。</p> - 網塚浩, 齋藤開, 柳澤達也, 田端千紘, 本間佳哉, 本多史憲, 李徳新, 仲村愛, 青木大 東北大学金属材料研究所附属量子エネルギー材料科学国際研究センター共同利用研究経過報告書(CD-ROM) 33- 145‐146 2016 [Not refereed][Not invited]
- 門別翔太, 稲垣宏幸, 村住太郎, 日高宏之, 柳澤達也, 網塚浩, HO Pei-Chun, MAPLE M. Brian 日本物理学会講演概要集(CD-ROM) 70- (1) 2015
- 田端千紘, 井原慶彦, 新村省悟, 齋藤開, 三浦植幸, 日高宏之, 柳澤達也, 網塚浩 日本物理学会講演概要集(CD-ROM) 70- (1) 2015
- 稲垣宏幸, 門別翔太, 清水悠晴, 柳澤達也, 日高宏之, 網塚浩, YAZICI D., MAPLE M.B., CONG P.T., ZHERLITSYN S., WOSNITZA J. 日本物理学会講演概要集(CD-ROM) 70- (2) 2015
- 田端千紘, 三浦植幸, UHLIROVA Klara, VALISKA Michal, SECHOVSKY Vladimir, 新村省悟, 齋藤開, 日高宏之, 柳澤達也, 井原慶彦, 網塚浩 日本物理学会講演概要集(CD-ROM) 70- (2) 2015
- 柳澤達也, YAZICI D., WHITE B. D., MAPLE M. B., 門別翔太, 日高宏之, 網塚浩, CONG P. T., ZHERLITSYN S., WOSNITZA J. 日本物理学会講演概要集(CD-ROM) 70- (2) 2015
- 門別翔太, 稲垣宏幸, 村住太郎, 日高宏之, 柳澤達也, 網塚浩, HO Pei-Chun, BRIANMAPLE M. 日本物理学会講演概要集(CD-ROM) 70- (2) 2015
- 永田涼馬, 田端千紘, 三浦植幸, 山崎聖悟, 門別翔太, 水内康太, 清水悠晴, 日高宏之, 柳澤達也, 網塚浩 日本物理学会講演概要集(CD-ROM) 70- (2) 2015
- Inagaki Hiroyuki, Zherlitsyn S, Wosnitza J, Monbetsu Shota, Shimizu Yusei, Yanagisawa Tatsuya, Hidaka Hiroyuki, Amitsuka Hiroshi, Yazici D, Maple M. B, Cong P. T Meeting Abstracts of the Physical Society of Japan 70- (0) 1673 -1673 2015 [Not refereed][Not invited]
- Mombetsu Shota, Inagaki Hiroyuki, Murazumi Taro, Hidaka Hiroyuki, Yanagisawa Tatsuya, Amitsuka Hiroshi, Ho Pei-Chun, Maple M. Brian Meeting Abstracts of the Physical Society of Japan 70- (0) 2015 [Not refereed][Not invited]
- Hidaka H, Mizuuchi K, Miura N, Nagata R, Tabata C, Yanagisawa T, Amitsuka H Meeting Abstracts of the Physical Society of Japan 70- (0) 2015 [Not refereed][Not invited]
- Saito H, Uenishi K, Miura N, Tabata C, Hidaka H, Yanagisawa T, Amitsuka H Meeting Abstracts of the Physical Society of Japan 70- (0) 2015 [Not refereed][Not invited]
- Tabata C, Ihara Y, Amitsuka H, Miura N, Uhlirova Klara, Valiska Michal, Sechovsky Vladimir, Shimmura S, Saito H, Hidaka H, Yanagisawa T Meeting Abstracts of the Physical Society of Japan 70- (0) 2347 -2347 2015 [Not refereed][Not invited]
- Uenishi K, Tabata C, Tatematsu E, Seguchi T, Saito H, Miura N, Hidaka H, Yanagisawa T, Amitsuka H Meeting Abstracts of the Physical Society of Japan 70- (0) 2015 [Not refereed][Not invited]
- Hidaka H, Shimmura S, Seguchi T, Saito H, Otani S, Yanagisawa T, Amitsuka H Meeting Abstracts of the Physical Society of Japan 70- (0) 2015 [Not refereed][Not invited]
- Seguchi T, Tabata C, Shimmura S, Nagata R, Saito H, Hidaka H, Yanagisawa T, Amitsuka H Meeting Abstracts of the Physical Society of Japan 70- (0) 2015 [Not refereed][Not invited]
- Yanagisawa T, Wosnitza J, Yazici D, White B. D, Maple M. B, Mombetsu S, Hidaka H, Amitsuka H, Cong P. T, Zherlitsyn S Meeting Abstracts of the Physical Society of Japan 70- (0) 2032 -2032 2015 [Not refereed][Not invited]
- Nagata R, Amitsuka H, Tabata C, Miura N, Yamazaki S, Mombetsu S, Mizuuchi K, Shimizu Y, Hidaka H, Yanagisawa T Meeting Abstracts of the Physical Society of Japan 70- (0) 2015 [Not refereed][Not invited]
- Mombetsu Shota, Inagaki Hiroyuki, Murazumi Taro, Hidaka Hiroyuki, Yanagisawa Tatsuya, Amitsuka Hiroshi, Ho Pei-Chun, Maple M. Brian Meeting Abstracts of the Physical Society of Japan 70- (0) 2015 [Not refereed][Not invited]
- Saito H, Miura N, Tabata C, Hidaka H, Yanagisawa T, Amitsuka H Meeting Abstracts of the Physical Society of Japan 70- (0) 2015 [Not refereed][Not invited]
- 網塚浩, 田端千紘, 三浦植幸, 立松愛梨, 柳澤達也, 日高宏之, 本間佳哉, 本多史憲, 李徳新, 仲村愛, 青木大 東北大学金属材料研究所附属量子エネルギー材料科学国際研究センター共同利用研究経過報告書(CD-ROM) 32- 87‐88 2015 [Not refereed][Not invited]
- 網塚浩, 田端千紘, 三浦植幸, 柳澤達也, 日高宏之, 本間佳哉, 李徳新, 本多史憲, 青木大 東北大学金属材料研究所附属量子エネルギー材料科学国際研究センター共同利用研究経過報告書(CD-ROM) 2014- 79 -80 2015 [Not refereed][Not invited]
- 網塚浩, 田端千紘, 三浦植幸, 柳澤達也, 日高宏之, 本間佳哉, 李徳新, 本多史憲, 青木大 東北大学金属材料研究所附属量子エネルギー材料科学国際研究センター共同利用研究経過報告書(CD-ROM) 30th- ROMBUNNO.II.(1).1 2014/06 [Not refereed][Not invited]
- 柳澤達也, 門別翔太, 日高宏之, 網塚浩, 赤津光洋, YASIN Shadi, ZHERLITSYN Sergei, WOSNITZA Jochen, HUANG Kevin, JANOSCHEK M., JANOSCHEK M., MAPLE M. Brian 日本物理学会講演概要集 69- (1) 2014
- 田端千紘, 山崎聖悟, 伊藤孝, 伊藤孝, 髭本亘, 髭本亘, 三浦植幸, 清水悠晴, 日高宏之, 柳澤達也, 網塚浩 日本物理学会講演概要集 69- (1) 2014
- 日高宏之, 山崎聖悟, 清水悠晴, 三浦植幸, 田端千紘, 柳澤達也, 網塚浩 日本物理学会講演概要集 69- (1) 2014
- 日高宏之, 齋藤開, 大谷真也, 瀬口泰生, 柳澤達也, 網塚浩 日本物理学会講演概要集 69- (2) 2014
- 日浦健太, 柳澤達也, 門別翔太, 村住太郎, 稲垣宏幸, 日高宏之, 網塚浩, 立岩尚之, 芳賀芳範 日本物理学会講演概要集 69- (2) 2014
- 田端千紘, 三浦植幸, 齋藤開, 瀬口泰生, 日高宏之, 柳澤達也, 網塚浩 日本物理学会講演概要集 69- (2) 2014
- 松野治貴, 森田恭平, 小手川恒, 藤秀樹, 清水悠晴, 清水悠晴, 柳澤達也, 網塚浩, 芳賀芳範, 山本悦嗣, 大貫惇睦 日本物理学会講演概要集 69- (2) 2014
- Matsuno H., Amitsuka H., Morita K., Kotegawa H., Tou H., Haga Y., Yamamoto E., Onuki Y., Shimizu Y., Yanagisawa T. Meeting Abstracts of the Physical Society of Japan 69- 645 -645 2014
- Matsuno H., Onuki Y., Morita K., Kotegawa H., Tou H., Shimizu Y., Yanagisawa T., Amitsuka H., Haga Y., Yamamoto E. Meeting Abstracts of the Physical Society of Japan 69- 363 -363 2014
- Yanagisawa T, Janoschek M, Maple Brian, Mombetsu S, Hidaka H, Amitsuka H, Akatsu M, Yasin Shaai, Zherlitsyn Sergei, Wasnitza Jochen, Huang Kevin Meeting Abstracts of the Physical Society of Japan 69- (0) 2014 [Not refereed][Not invited]
- Tabata C, Miura N, Saito H, Seguchi T, Hidaka H, Yanagisawa T, Amitsuka H Meeting Abstracts of the Physical Society of Japan 69- (0) 2014 [Not refereed][Not invited]
- Hidaka H, Yamazaki S, Shimizu Y, Miura N, Tabata C, Yanagisawa T, Amitsuka H Meeting Abstracts of the Physical Society of Japan 69- (0) 2014 [Not refereed][Not invited]
- Tabata C, Yamazaki S, Ito T. U, Higemoto W, Miura N, Shimizu Y, Hidaka H, Yanagisawa T, Amitsuka H Meeting Abstracts of the Physical Society of Japan 69- (0) 553 -553 2014 [Not refereed][Not invited]
- Hidaka H, Saito H, Otani S, Seguchi T, Yanagisawa T, Amitsuka H Meeting Abstracts of the Physical Society of Japan 69- (0) 2014 [Not refereed][Not invited]
- Murazumi T, Inagaki H, Mombetsu S, Hidaka H, Yanagisawa T, Amitsuka H Meeting Abstracts of the Physical Society of Japan 69- (0) 407 -407 2014 [Not refereed][Not invited]
- Saito H, Uenishi K, Miura N, Tabata C, Matsumori H, Mizuuchi K, Hidaka H, Yanagisawa T, Amitsuka H Meeting Abstracts of the Physical Society of Japan 69- (0) 407 -407 2014 [Not refereed][Not invited]
- Hiura K, Yanagisawa T, Mombetsu S, Murazumi T, Inagaki H, Hidaka H, Amitsuka H, Tateiwa N, Haga Y Meeting Abstracts of the Physical Society of Japan 69- (0) 460 -460 2014 [Not refereed][Not invited]
- 田端千紘, 山崎聖悟, 伊藤孝, 髭本亘, 三浦植幸, 清水悠晴, 日高宏之, 柳澤達也, 網塚浩 物構研サイエンスフェスタ要旨集 2013- 33 2014 [Not refereed][Not invited]
- 網塚浩, 田端千紘, 日高宏之, 柳澤達也, 熊井玲児, 小林賢介, 中尾裕則, 村上洋一, 稲見俊哉, 道村真司, 横山淳 物構研サイエンスフェスタ要旨集 2013- 33 2014 [Not refereed][Not invited]
- Hidaka H, Yamazaki S, Saito H, Shimizu Y, Mombetsu S, Murazumi T, Miura N, Tabata C, Yanagisawa T, Amitsuka H Meeting abstracts of the Physical Society of Japan 68- (2) 445 -445 2013/08/26 [Not refereed][Not invited]
- Mombetsu S, Murazumi T, Hiura K, Yamazaki S, Shimizu Y, Hidaka H, Yanagisawa T, Amitsuka H Meeting abstracts of the Physical Society of Japan 68- (2) 445 -445 2013/08/26 [Not refereed][Not invited]
- Otani S, Hidaka H, Saito H, Tatsumi K, Yanagisawa T, Amitsuka H Meeting abstracts of the Physical Society of Japan 68- (2) 446 -446 2013/08/26 [Not refereed][Not invited]
- Abiko K, Saito H, Miura N, Uenishi K, Seguchi T, Tabata C, Hidaka H, Yanagisawa T, Amitsuka H Meeting abstracts of the Physical Society of Japan 68- (2) 507 -507 2013/08/26 [Not refereed][Not invited]
- Tabata C, Inami T, Michimura S, Yokoyama M, Hidaka H, Yanagisawa T, Amitsuka H Meeting abstracts of the Physical Society of Japan 68- (2) 553 -553 2013/08/26 [Not refereed][Not invited]
- Matsuno H, Morita K, Kotegawa H, Tou H, Haga Y, Yamamoto E, Onuki Y, Shimizu Y, Yanagisawa T, Amitsuka H Meeting abstracts of the Physical Society of Japan 68- (2) 554 -554 2013/08/26 [Not refereed][Not invited]
- Miura N, Shimizu Y, Yamazaki S, Saito H, Tabata C, Mombetsu S, Hidaka H, Yanagisawa T, Amitsuka H Meeting abstracts of the Physical Society of Japan 68- (2) 555 -555 2013/08/26 [Not refereed][Not invited]
- 門別翔太, 村住太郎, 日浦健太, 山崎聖悟, 清水悠晴, 日高宏之, 柳澤達也, 網塚浩 日本物理学会講演概要集 68- (2) 445 2013/08/26 [Not refereed][Not invited]
- 大谷真也, 日高宏之, 齋藤開, 巽かおり, 柳澤達也, 網塚浩 日本物理学会講演概要集 68- (2) 446 2013/08/26 [Not refereed][Not invited]
- 松野治貴, 森田恭平, 小手川恒, 藤秀樹, 芳賀芳範, 山本悦嗣, 大貫惇睦, 清水悠晴, 柳澤達也, 網塚浩 日本物理学会講演概要集 68- (2) 554 2013/08/26 [Not refereed][Not invited]
- 安孫子和弘, 齋藤開, 三浦植幸, 上西健太, 瀬口泰生, 田端千紘, 日高宏之, 柳澤達也, 網塚浩 日本物理学会講演概要集 68- (2) 507 -507 2013/08/26 [Not refereed][Not invited]
- 日高宏之, 山崎聖悟, 齋藤開, 清水悠晴, 門別翔太, 村住太郎, 三浦植幸, 田端千紘, 柳澤達也, 網塚浩 日本物理学会講演概要集 68- (2) 445 2013/08/26 [Not refereed][Not invited]
- 三浦植幸, 清水悠晴, 山崎聖悟, 齋藤開, 田端千紘, 門別翔太, 日高宏之, 柳澤達也, 網塚浩 日本物理学会講演概要集 68- (2) 555 2013/08/26 [Not refereed][Not invited]
- 田端千紘, 稲見俊哉, 道村真司, 横山淳, 日高宏之, 柳澤達也, 網塚浩 日本物理学会講演概要集 68- (2) 553 2013/08/26 [Not refereed][Not invited]
- 網塚浩, 柳澤達也, 日高宏之, 本間佳哉, 李徳新, 田端千紘, 門別翔太, 日浦健太 東北大学金属材料研究所附属量子エネルギー材料科学国際研究センター共同利用研究経過報告書(CD-ROM) 29th- ROMBUNNO.VI.4 2013/06 [Not refereed][Not invited]
- Tabata C, Hidaka H, Yanagisawa T, Yokoyama M, Amitsuka H, Kobayashi K, Kumai R, Nakao H, Murakami Y Meeting abstracts of the Physical Society of Japan 68- (1) 568 -568 2013/03/26 [Not refereed][Not invited]
- Yanagisawa T, Mombetsu S, Hidaka H, Amitsuka H, Akatsu M, Yasin Shadi, Zherlitsyn Sergei, Wosnitza Jochen, Huang Kevin, Maple M. Brian Meeting abstracts of the Physical Society of Japan 68- (1) 569 -569 2013/03/26 [Not refereed][Not invited]
- Hiura K, Mombetsu S, Hidaka H, Yanagisawa T, Amitsuka H, Tateiwa N, Haga Y Meeting abstracts of the Physical Society of Japan 68- (1) 570 -570 2013/03/26 [Not refereed][Not invited]
- Mombetsu S, Hiura K, Hidaka H, Yanagisawa T, Amitsuka H, Maple M. B Meeting abstracts of the Physical Society of Japan 68- (1) 586 -586 2013/03/26 [Not refereed][Not invited]
- Yamazaki S, Shimizu Y, Saito H, Tabata C, Mombetsu S, Hidaka H, Yanagisawa T, Amitsuka H Meeting abstracts of the Physical Society of Japan 68- (1) 587 -587 2013/03/26 [Not refereed][Not invited]
- Hidaka H, Saito H, Otani S, Tatsumi K, Yanagisawa T, Amitsuka H Meeting abstracts of the Physical Society of Japan 68- (1) 685 -685 2013/03/26 [Not refereed][Not invited]
- 門別翔太, 日浦健太, 日高宏之, 柳澤達也, 網塚浩, MAPLE M. B 日本物理学会講演概要集 68- (1) 586 2013/03/05 [Not refereed][Not invited]
- 日高宏之, 齋藤開, 大谷真也, 巽かおり, 柳澤達也, 網塚浩 日本物理学会講演概要集 68- (1) 685 2013/03/05 [Not refereed][Not invited]
- 田端千紘, 日高宏之, 柳澤達也, 横山淳, 網塚浩, 小林賢介, 熊井玲児, 中尾裕則, 村上洋一 日本物理学会講演概要集 68- (1) 568 2013/03/05 [Not refereed][Not invited]
- 日浦健太, 門別翔太, 日高宏之, 柳澤達也, 網塚浩, 立岩尚之, 芳賀芳範 日本物理学会講演概要集 68- (1) 570 2013/03/05 [Not refereed][Not invited]
- 柳澤達也, 門別翔太, 日高宏之, 網塚浩, 赤津光洋, YASIN Shadi, ZHERLITSYN Sergei, WOSNITZA Jochen, HUANG Kevin, MAPLE M. Brian 日本物理学会講演概要集 68- (1) 569 2013/03/05 [Not refereed][Not invited]
- 山崎聖悟, 清水悠晴, 齋藤開, 田端千紘, 門別翔太, 日高宏之, 柳澤達也, 網塚浩 日本物理学会講演概要集 68- (1) 587 2013/03/05 [Not refereed][Not invited]
- 田端千紘, 日高宏之, 柳澤達也, 横山淳, 網塚浩, 小林賢介, 熊井玲児, 中尾裕則, 村上洋一 物構研サイエンスフェスタ要旨集 1st- 34 2013 [Not refereed][Not invited]
- YANAGISAWA T, MOMBETSU S, HIDAKA H, AMITSUKA H, AKATSU M, YASIN S, ZHERLITSYN S, WOSNITZA J, HUANG K, MAPLE M. B 日本物理学会講演概要集 67- (2) 466 -466 2012/08/24 [Not refereed][Not invited]
- Tabata C, Miura N, Abiko K, Hidaka H, Yanagisawa T, Yokoyama M, Amitsuka H, Kobayashi K, Kumai R, Nakao H, Murakami Y Meeting abstracts of the Physical Society of Japan 67- (2) 465 -465 2012/08/24 [Not refereed][Not invited]
- Mombetsu S, Hiura K, Hidaka H, Yanagisawa T, Amitsuka H, Maple M. B Meeting abstracts of the Physical Society of Japan 67- (2) 494 -494 2012/08/24 [Not refereed][Not invited]
- Otani S, Hidaka H, Tatsumi K, Shimizu Y, Igarashi H, Yanagisawa T, Amitsuka H Meeting abstracts of the Physical Society of Japan 67- (2) 548 -548 2012/08/24 [Not refereed][Not invited]
- 田端千紘, 三浦植幸, 安孫子和弘, 日高宏之, 柳澤達也, 横山淳, 網塚浩, 小林賢介, 熊井玲児, 中尾裕則, 村上洋一 日本物理学会講演概要集 67- (2) 465 2012/08/24 [Not refereed][Not invited]
- 大谷真也, 日高宏之, 巽かおり, 清水悠晴, 五十嵐英紀, 柳澤達也, 網塚浩 日本物理学会講演概要集 67- (2) 548 2012/08/24 [Not refereed][Not invited]
- 門別翔太, 日浦健太, 日高宏之, 柳澤達也, 網塚浩, MAPLE M. B 日本物理学会講演概要集 67- (2) 494 2012/08/24 [Not refereed][Not invited]
- 網塚浩, 本間佳哉, 李徳新, 柳澤達也, 清水悠晴, 田端千紘 東北大学金属材料研究所附属量子エネルギー材料科学国際研究センター共同利用研究経過報告書(CD-ROM) 2011- ROMBUNNO.VI.5 2012/06 [Not refereed][Not invited]
- 日高宏之, 大谷真也, 若林琢巳, 清水悠晴, 網塚浩, 柳澤達也, RAMOS S. M, HERING E. N, FONTES M. B, BAGGIO‐SAITOVITCH E 日本物理学会講演概要集 67- (1) 561 2012/03/05 [Not refereed][Not invited]
- 門別翔太, 柳澤達也, 日高宏之, 網塚浩, 赤津光洋, 根本祐一, 後藤輝孝, YASHIN S, ZHERLITSYN S, WOSNITZA J 日本物理学会講演概要集 67- (1) 649 2012/03/05 [Not refereed][Not invited]
- 田端千紘, 三浦植幸, 安孫子和弘, 日高宏之, 柳澤達也, 横山淳, 網塚浩, 小林賢介, 熊井玲児, 中尾裕則, 村上洋一 日本物理学会講演概要集 67- (1) 637 -637 2012/03/05 [Not refereed][Not invited]
- 柳澤達也, 門別翔太, 日高宏之, 網塚浩, 赤津光洋, 根本祐一, 後藤輝孝, YASHIN S, ZHERLITSYN S, WOSNITZA J 日本物理学会講演概要集 67- (1) 559 2012/03/05 [Not refereed][Not invited]
- 井原慶彦, 藤井俊介, 門別翔太, 柳澤達也 日本物理学会講演概要集 67- (1) 560 2012/03/05 [Not refereed][Not invited]
- Yanagisawa T, Mombetsu S, Hidaka H, Amitsuka H, Akatsu M, Nemoto Y, Goto T, Yashin S, Zherlitsyn S, Wosnitza J Meeting abstracts of the Physical Society of Japan 67- (1) 559 -559 2012/03/05 [Not refereed][Not invited]
- Ihara Y, Fujii S, Mombetsu S, Yanagisawa T Meeting abstracts of the Physical Society of Japan 67- (1) 560 -560 2012/03/05 [Not refereed][Not invited]
- Hidaka H, Otani S, Wakabayashi T, Shimizu Y, Amitsuka H, Yanagisawa T, Ramos S.M, Hering E.N, Fontes M.B, Saitovitch E Meeting abstracts of the Physical Society of Japan 67- (1) 561 -561 2012/03/05 [Not refereed][Not invited]
- Otani S, Hidaka H, Shimizu Y, Igarashi H, Yanagisawa T, Amitsuka H Meeting abstracts of the Physical Society of Japan 67- (1) 572 -572 2012/03/05 [Not refereed][Not invited]
- Tabata C, Miura N, Abiko K, Hidaka H, Yanagisawa T, Yokoyama M, Amitsuka H, Kobayashi K, Kumai R, Nakao H, Murakami Y Meeting abstracts of the Physical Society of Japan 67- (1) 637 -637 2012/03/05 [Not refereed][Not invited]
- Igarashi H, Hidaka H, Shimizu Y, Tabata C, Yanagisawa T, Amitsuka H Meeting abstracts of the Physical Society of Japan 67- (1) 637 -637 2012/03/05 [Not refereed][Not invited]
- Mombetsu S, Yanagisawa T, Hidaka H, Amitsuka H, Akatsu M, Nemoto Y, Goto T, Yashin S, Zherlitsyn S, Wosnitza J Meeting abstracts of the Physical Society of Japan 67- (1) 649 -649 2012/03/05 [Not refereed][Not invited]
- 五十嵐英紀, 日高宏之, 清水悠晴, 田端千紘, 柳澤達也, 網塚浩 日本物理学会講演概要集 67- (1) 637 -637 2012/03/05 [Not refereed][Not invited]
- 大谷真也, 日高宏之, 清水悠晴, 五十嵐英紀, 柳澤達也, 網塚浩 日本物理学会講演概要集 67- (1) 572 -572 2012/03/05 [Not refereed][Not invited]
- 網塚浩, 田端千紘, 門別翔太, 柳澤達也, 横山淳, 桑原慶太郎, 須田山貴亮, 岡本淳, 山崎裕一, 中尾裕則, 村上洋一 PFシンポジウム要旨集 29th- 49 2012 [Not refereed][Not invited]
- 田端千紘, 三浦植幸, 安孫子和弘, 日高宏之, 柳澤達也, 横山淳, 網塚浩, 小林賢介, 熊井玲児, 中尾裕則, 村上洋一 PFシンポジウム要旨集 29th- 48 2012 [Not refereed][Not invited]
- 柳澤達也, 門別翔太, 日高宏之, 網塚浩, 赤津光洋, 荒木幸治, 根本祐一, 後藤輝孝, HO Pei‐Chun, BAUMBACH Ryan E, MAPLE M. Brian 日本物理学会講演概要集 66- (2) 596 2011/08/24 [Not refereed][Not invited]
- 清水悠晴, 池田陽一, 芳賀芳範, 日高宏之, 柳澤達也, 網塚浩 日本物理学会講演概要集 66- (2) 635 2011/08/24 [Not refereed][Not invited]
- 五十嵐英紀, 日高宏之, 清水悠晴, 田端千紘, 柳澤達也, 網塚浩 日本物理学会講演概要集 66- (2) 611 -611 2011/08/24 [Not refereed][Not invited]
- Yanagisawa T, Monbetsu S, Hidaka H, Amitsuka H, Akatsu M, Araki K, Nemoto Y, Goto T, Ho Pei-Chun, Baumbach Ryan E, Maple M. Brian Meeting abstracts of the Physical Society of Japan 66- (2) 596 -596 2011/08/24 [Not refereed][Not invited]
- Igarashi H, Hidaka H, Shimizu Y, Tabata C, Yanagisawa T, Amitsuka H Meeting abstracts of the Physical Society of Japan 66- (2) 611 -611 2011/08/24 [Not refereed][Not invited]
- Shimizu Y, Ikeda Y, Haga Y, Hidaka H, Yanagisawa T, Amitsuka H Meeting abstracts of the Physical Society of Japan 66- (2) 635 -635 2011/08/24 [Not refereed][Not invited]
- Watanabe Y, Saito H, Hiura K, Shimizu Y, Yanagisawa T, Hidaka H, Yokoyama M, Amitsuka H Meeting abstracts of the Physical Society of Japan 66- (2) 2011/08/24 [Not refereed][Not invited]
- 網塚浩, 本間佳哉, 李徳新, 柳澤達也, 日高宏之, 清水悠晴, 倉橋洋祐, 高橋宗佑, 齋藤旬, 田端千紘 東北大学金属材料研究所附属量子エネルギー材料科学国際研究センター共同利用研究経過報告書(CD-ROM) 2010- ROMBUNNO.VI.6 2011/06 [Not refereed][Not invited]
- 清水悠晴, 池田陽一, 天谷健一, 芳賀芳範, 日高宏之, 柳澤達也, 網塚浩 日本物理学会講演概要集 66- (1) 518 2011/03/03 [Not refereed][Not invited]
- Shimizu Y, Ikeda Y, Tenya K, Haga Y, Hidaka H, Yanagisawa T, Amitsuka H Meeting abstracts of the Physical Society of Japan 66- (1) 518 -518 2011/03/03 [Not refereed][Not invited]
- 高橋宗佑, 日高宏之, 清水悠晴, 倉橋洋祐, 柳澤達也, 網塚浩 日本物理学会講演概要集 65- (2) 618 2010/08/18 [Not refereed][Not invited]
- 日高宏之, 五十嵐英紀, 田中淳, 高橋宗佑, 柳澤達也, 網塚浩 日本物理学会講演概要集 65- (2) 617 2010/08/18 [Not refereed][Not invited]
- 柳澤達也, 齋藤旬, 日高宏之, 網塚浩, 赤津光洋, 荒木幸治, 高橋直紀, 根本祐一, 後藤輝孝, HO Pei‐Chun, BAUMBACH Ryan E, MAPLE M. Brian 日本物理学会講演概要集 65- (2) 585 2010/08/18 [Not refereed][Not invited]
- 齋藤旬, 柳澤達也, 真山太一, 池田陽一, 日高宏之, 横山淳, 網塚浩 日本物理学会講演概要集 65- (2) 603 2010/08/18 [Not refereed][Not invited]
- 倉橋洋祐, 西川大地, 清水悠晴, 日高宏之, 柳澤達也, 横山淳, 網塚浩 日本物理学会講演概要集 65- (2) 602 2010/08/18 [Not refereed][Not invited]
- 清水悠晴, 池田陽一, 天谷健一, 芳賀芳範, 日高宏之, 柳澤達也, 網塚浩 日本物理学会講演概要集 65- (2) 605 2010/08/18 [Not refereed][Not invited]
- Yanagisawa T, Saito H, Hidaka H, Amitsuka H, Akatsu M, Araki K, Takahashi N, Nemoto Y, Goto T, Ho Pei-Chun, Baumbach Ryan E, Maple M. Brian Meeting abstracts of the Physical Society of Japan 65- (2) 585 -585 2010/08/18 [Not refereed][Not invited]
- Kurahashi Y, Nishikawa D, Shimizu Y, Hidaka H, Yanagisawa T, Yokoyama M, Amitsuka H Meeting abstracts of the Physical Society of Japan 65- (2) 602 -602 2010/08/18 [Not refereed][Not invited]
- Saito H, Yanagisawa T, Mayama T, Ikeda Y, Hidaka H, Yokoyama M, Amitsuka H Meeting abstracts of the Physical Society of Japan 65- (2) 2010/08/18 [Not refereed][Not invited]
- Shimizu T, Ikeda Y, Tenya K, Haga Y, Hidaka H, Yanagisawa T, Amitsuka H Meeting abstracts of the Physical Society of Japan 65- (2) 605 -605 2010/08/18 [Not refereed][Not invited]
- Hidaka H, Igarashi H, Tanaka A, Takahashi S, Yanagisawa T, Amitsuka H Meeting abstracts of the Physical Society of Japan 65- (2) 2010/08/18 [Not refereed][Not invited]
- Takahashi S, Hidaka H, Shimizu Y, Kurahashi Y, Yanagisawa T, Amitsuka H Meeting abstracts of the Physical Society of Japan 65- (2) 2010/08/18 [Not refereed][Not invited]
- 網塚浩, 柳澤達也, 日高宏之, 池田陽一, 清水悠晴, 西川大地, 田中淳, 真山太一, 横山淳, 芳賀芳範, 本間佳哉 東北大学金属材料研究所附属量子エネルギー材料科学国際研究センター共同利用研究経過報告書(CD-ROM) 2009- ROMBUNNO.VI.6 2010/07 [Not refereed][Not invited]
- Nishikawa D, Ikeda Y, Shimizu Y, Hidaka H, Yanagisawa T, Yokoyama M, Amitsuka H Meeting abstracts of the Physical Society of Japan 65- (1) 629 -629 2010/03/01 [Not refereed][Not invited]
- 西川大地, 池田陽一, 清水悠晴, 日高宏之, 柳澤達也, 横山淳, 網塚浩 日本物理学会講演概要集 65- (1) 629 2010/03/01 [Not refereed][Not invited]
- 清水悠晴, 池田陽一, 若林琢巳, 天谷健一, 芳賀芳範, 日高宏之, 柳澤達也, 網塚浩 日本物理学会講演概要集 65- (1) 631 2010/03/01 [Not refereed][Not invited]
- 齋藤旬, 柳澤達也, 真山太一, 池田陽一, 日高宏之, 横山淳, 網塚浩 日本物理学会講演概要集 65- (1) 605 -605 2010/03/01 [Not refereed][Not invited]
- 日高宏之, 五十嵐英紀, 田中淳, 柳澤達也, 網塚浩 日本物理学会講演概要集 65- (1) 606 -606 2010/03/01 [Not refereed][Not invited]
- 柳澤達也, 日高宏之, 網塚浩, CICHOREK T, HENKIE Z, MAPLE M 日本物理学会講演概要集 65- (1) 608 2010/03/01 [Not refereed][Not invited]
- Saito H, Yanagisawa T, Mayama T, Ikeda Y, Hidaka H, Yokoyama M, Amitsuka H Meeting abstracts of the Physical Society of Japan 65- (1) 605 -605 2010/03/01 [Not refereed][Not invited]
- Hidaka H, Igarashi H, Tanaka A, Yanagisawa T, Amitsuka H Meeting abstracts of the Physical Society of Japan 65- (1) 606 -606 2010/03/01 [Not refereed][Not invited]
- Yanagisawa T, Hidaka H, Amitsuka H, Cichorek T, Henkie Z, Maple M. B Meeting abstracts of the Physical Society of Japan 65- (1) 608 -608 2010/03/01 [Not refereed][Not invited]
- Shimizu Y, Ikeda Y, Wakabayashi T, Tenya K, Haga Y, Hidaka H, Yanagisawa T, Amitsuka H Meeting abstracts of the Physical Society of Japan 65- (1) 631 -631 2010/03/01 [Not refereed][Not invited]
- 田中淳, 高橋宗佑, 日高宏之, 柳澤達也, 網塚浩 日本物理学会講演概要集 64- (2) 461 2009/08/18 [Not refereed][Not invited]
- 西川大地, 池田陽一, 日高宏之, 柳澤達也, 横山淳, 網塚浩 日本物理学会講演概要集 64- (2) 461 2009/08/18 [Not refereed][Not invited]
- 若林琢巳, 日高宏之, 柳澤達也, 横山淳, 天谷健一, 網塚浩 日本物理学会講演概要集 64- (2) 427 -427 2009/08/18 [Not refereed][Not invited]
- Wakabayashi T, Hidaka H, Yanagisawa T, Yokoyama M, Tenya K, Amitsuka H Meeting abstracts of the Physical Society of Japan 64- (2) 427 -427 2009/08/18 [Not refereed][Not invited]
- Hidaka H, Tanaka A, Ikeda Y, Yanagisawa T, Amitsuka H Meeting abstracts of the Physical Society of Japan 64- (2) 449 -449 2009/08/18 [Not refereed][Not invited]
- Ikeda Y, Nishikawa D, Tanaka A, Kurahashi Y, Shimizu Y, Hidaka H, Yanagisawa T, Yokoyama M, Tenya K, Amitsuka H Meeting abstracts of the Physical Society of Japan 64- (2) 2009/08/18 [Not refereed][Not invited]
- Nishikawa D, Ikeda Y, Hidaka H, Yanagisawa T, Yokoyama M, Amitsuka H Meeting abstracts of the Physical Society of Japan 64- (2) 2009/08/18 [Not refereed][Not invited]
- Tanaka A, Takahashi S, Hidaka H, Yanagisawa T, Amitsuka H Meeting abstracts of the Physical Society of Japan 64- (2) 461 -461 2009/08/18 [Not refereed][Not invited]
- Yanagisawa T, Saito H, Mayama T, Ikeda Y, Hidaka H, Amitsuka H, Nemoto Y, Goto T, Takeda N, Ho P. -C, Maple M. B Meeting abstracts of the Physical Society of Japan 64- (2) 475 -475 2009/08/18 [Not refereed][Not invited]
- Shimizu Y, Ikeda Y, Tenya K, Haga Y, Hidaka H, Yanagisawa T, Amitsuka H Meeting abstracts of the Physical Society of Japan 64- (2) 553 -553 2009/08/18 [Not refereed][Not invited]
- Mayama T, Yanagisawa T, Satio H, Hidaka H, Amitsuka H, Tateiwa N, Haga Y Meeting abstracts of the Physical Society of Japan 64- (2) 554 -554 2009/08/18 [Not refereed][Not invited]
- 池田陽一, 西川大地, 田中淳, 倉橋洋祐, 清水悠晴, 日高宏之, 柳澤達也, 横山淳, 天谷健一, 網塚浩 日本物理学会講演概要集 64- (2) 460 2009/08/18 [Not refereed][Not invited]
- 柳澤達也, 齋藤旬, 真山太一, 池田陽一, 日高宏之, 網塚浩, 根本祐一, 後藤輝孝, 武田直也, HO P.‐C, MAPLE M. B 日本物理学会講演概要集 64- (2) 475 2009/08/18 [Not refereed][Not invited]
- 真山太一, 柳澤達也, 齋藤旬, 日高宏之, 網塚浩, 立岩尚之, 芳賀芳範 日本物理学会講演概要集 64- (2) 554 2009/08/18 [Not refereed][Not invited]
- 日高宏之, 田中淳, 池田陽一, 柳澤達也, 網塚浩 日本物理学会講演概要集 64- (2) 449 2009/08/18 [Not refereed][Not invited]
- 清水悠晴, 池田陽一, 天谷健一, 芳賀芳範, 日高宏之, 柳澤達也, 網塚浩 日本物理学会講演概要集 64- (2) 553 2009/08/18 [Not refereed][Not invited]
- Nishikawa D, Ishihara Y, Takayama S, Hidaka H, Yanagisawa T, Yokoyama M, Amitsuka H, Kreitlow Jan, Sullow Stefan Meeting abstracts of the Physical Society of Japan 64- (1) 524 -524 2009/03/03 [Not refereed][Not invited]
- Ikeda Y, Yokoyama M, Nishikawa D, Hidaka H, Yanagisawa T, Tenya K, Kawarazaki S, Sato T. J, Yoshizawa H, Amitsuka H Meeting abstracts of the Physical Society of Japan 64- (1) 2009/03/03 [Not refereed][Not invited]
- Amitsuka H, Takayama S, Ikeda Y, Kawasaki I, Hidaka H, Yanagisawa T, Yokoyama M, Inami T, Haga Y, Homma Y Meeting abstracts of the Physical Society of Japan 64- (1) 525 -525 2009/03/03 [Not refereed][Not invited]
- Morishita A, Hidaka H, Yanagisawa T, Yokoyama M, Tenya K, Amitsuka H Meeting abstracts of the Physical Society of Japan 64- (1) 525 -525 2009/03/03 [Not refereed][Not invited]
- Yamaguchi A, Goto S, Ishii I, Akatsu M, Nemoto Y, Goto T, Takeda N, Yanagisawa T Meeting abstracts of the Physical Society of Japan 64- (1) 532 -532 2009/03/03 [Not refereed][Not invited]
- Kawasaki I, Hidaka H, Yanagisawa T, Yokoyama M, Tenya K, Amitsuka H Meeting abstracts of the Physical Society of Japan 64- (1) 539 -539 2009/03/03 [Not refereed][Not invited]
- Yanagisawa T, Saito H, Mayama T, Hiroyuki H, Amitsuka H Meeting abstracts of the Physical Society of Japan 64- (1) 545 -545 2009/03/03 [Not refereed][Not invited]
- Shimizu Y, Hidaka H, Takahashi S, Nishikawa D, Kawasaki I, Yanagisawa T, Amitsuka H, Tenya K Meeting abstracts of the Physical Society of Japan 64- (1) 547 -547 2009/03/03 [Not refereed][Not invited]
- Hidaka H, Tanaka A, Ikeda Y, Kawasaki I, Yanagisawa T, Amitsuka H Meeting abstracts of the Physical Society of Japan 64- (1) 548 -548 2009/03/03 [Not refereed][Not invited]
- Wakabayashi T, Kawasaki I, Hidaka H, Amitsuka H, Yanagisawa T, Yokoyama M, Tenya K Meeting abstracts of the Physical Society of Japan 64- (1) 551 -551 2009/03/03 [Not refereed][Not invited]
- 西川大地, 石原祐子, 高山茂貴, 日高宏之, 柳澤達也, 横山淳, 網塚浩, KREITLOW Jan, SULLOW Stefan 日本物理学会講演概要集 64- (1) 524 -524 2009/03/03 [Not refereed][Not invited]
- 若林琢巳, 川崎郁斗, 日高宏之, 網塚浩, 柳澤達也, 横山淳, 天谷健一 日本物理学会講演概要集 64- (1) 551 2009/03/03 [Not refereed][Not invited]
- 柳澤達也, 齋藤旬, 真山太一, 日高宏之, 網塚浩 日本物理学会講演概要集 64- (1) 545 2009/03/03 [Not refereed][Not invited]
- 清水悠晴, 日高宏之, 高橋宗佑, 西川大地, 川崎郁斗, 柳澤達也, 網塚浩, 天谷健一 日本物理学会講演概要集 64- (1) 547 -547 2009/03/03 [Not refereed][Not invited]
- 池田陽一, 横山淳, 西川大地, 日高宏之, 柳澤達也, 天谷健一, 河原崎修三, 佐藤卓, 吉沢英樹, 網塚浩 日本物理学会講演概要集 64- (1) 525 2009/03/03 [Not refereed][Not invited]
- 森下明, 日高宏之, 柳澤達也, 横山淳, 天谷健一, 網塚浩 日本物理学会講演概要集 64- (1) 525 -525 2009/03/03 [Not refereed][Not invited]
- 網塚浩, 高山茂貴, 池田陽一, 川崎郁斗, 日高宏之, 柳澤達也, 横山淳, 稲見俊哉, 芳賀芳範, 本間佳哉 日本物理学会講演概要集 64- (1) 525 -525 2009/03/03 [Not refereed][Not invited]
- 川崎郁斗, 日高宏之, 柳澤達也, 横山淳, 天谷健一, 網塚浩 日本物理学会講演概要集 64- (1) 539 2009/03/03 [Not refereed][Not invited]
- 日高宏之, 田中淳, 池田陽一, 川崎郁斗, 柳澤達也, 網塚浩 日本物理学会講演概要集 64- (1) 548 2009/03/03 [Not refereed][Not invited]
- 山口高央, 後藤沙織, 石井勲, 赤津光洋, 根本祐一, 後藤輝孝, 武田直也, 柳澤達也 日本物理学会講演概要集 64- (1) 532 2009/03/03 [Not refereed][Not invited]
- Yanagisawa T, Mayama T, Morishita A, Hidaka H, Amitsuka H, Yamaguchi A, Nemoto Y, Goto T, Takeda N, Ho Pei-Chun, Maple M. Brian Meeting abstracts of the Physical Society of Japan 63- (2) 495 -495 2008/08/25 [Not refereed][Not invited]
- Yamaguchi A, Goto S, Ishii I, Akatsu M, Nemoto Y, Goto T, Takeda N, Yanagisawa T Meeting abstracts of the Physical Society of Japan 63- (2) 496 -496 2008/08/25 [Not refereed][Not invited]
- Hidaka H, Ikeda Y, Kawasaki I, Yanagisawa T, Amitsuka H Meeting abstracts of the Physical Society of Japan 63- (2) 504 -504 2008/08/25 [Not refereed][Not invited]
- Wakabayashi T, Kawasaki I, Morishita A, Hidaka H, Amitsuka H, Yanagisawa T, Yokoyama M, Tenya K Meeting abstracts of the Physical Society of Japan 63- (2) 506 -506 2008/08/25 [Not refereed][Not invited]
- Ikeda Y, Tanaka A, Takayama S, Ishihara Y, Hidaka H, Yanagisawa T, Yokoyama M, Tenya K, Amitsuka H Meeting abstracts of the Physical Society of Japan 63- (2) 516 -516 2008/08/25 [Not refereed][Not invited]
- Ishihara Y, Takayama S, Morishita A, Hidaka H, Amitsuka H, Yanagisawa T, Tenya K, Yokoyama M, Kreitlow Jan, Sullow Stefan, Sawai Y, Kindo K, Honma Y Meeting abstracts of the Physical Society of Japan 63- (2) 2008/08/25 [Not refereed][Not invited]
- Shimizu Y, Hidaka H, Nishikawa D, Kawasaki I, Yanagisawa T, Amitsuka H, Tenya K, Haga Y, Onuki Y Meeting abstracts of the Physical Society of Japan 63- (2) 518 -518 2008/08/25 [Not refereed][Not invited]
- Kawasaki I, Nishikawa D, Hidaka H, Yanagisawa T, Yokoyama M, Tenya K, Amitsuka H Meeting abstracts of the Physical Society of Japan 63- (2) 555 -555 2008/08/25 [Not refereed][Not invited]
- 若林琢巳, 川崎郁斗, 森下明, 日高宏之, 網塚浩, 柳澤達也, 横山淳, 天谷健一 日本物理学会講演概要集 63- (2) 506 2008/08/25 [Not refereed][Not invited]
- 柳澤達也, 真山太一, 森下明, 日高宏之, 網塚浩, 山口高央, 根本祐一, 後藤輝孝, 武田直也, HO Pei‐Chun, MAPLE M.Brian 日本物理学会講演概要集 63- (2) 495 2008/08/25 [Not refereed][Not invited]
- 山口高央, 後藤沙織, 石井勲, 赤津光洋, 根本祐一, 後藤輝孝, 武田直也, 柳澤達也 日本物理学会講演概要集 63- (2) 496 2008/08/25 [Not refereed][Not invited]
- 日高宏之, 池田陽一, 川崎郁斗, 柳澤達也, 網塚浩 日本物理学会講演概要集 63- (2) 504 -504 2008/08/25 [Not refereed][Not invited]
- 清水悠晴, 日高宏之, 西川大地, 川崎郁斗, 柳澤達也, 網塚浩, 天谷健一, 芳賀芳範, 大貫惇睦, 大貫惇睦 日本物理学会講演概要集 63- (2) 518 -518 2008/08/25 [Not refereed][Not invited]
- 川崎郁斗, 西川大地, 日高宏之, 柳澤達也, 横山淳, 天谷健一, 網塚浩 日本物理学会講演概要集 63- (2) 555 2008/08/25 [Not refereed][Not invited]
- 石原祐子, 高山茂貴, 森下明, 日高宏之, 網塚浩, 柳澤達也, 天谷健一, 横山淳, KREITLOW Jan, SUELLOW Stefan, 沢井祥束, 金道浩一, 本間佳哉 日本物理学会講演概要集 63- (2) 517 2008/08/25 [Not refereed][Not invited]
- 池田陽一, 田中淳, 高山茂貴, 石原祐子, 日高宏之, 柳澤達也, 横山淳, 天谷健一, 網塚浩 日本物理学会講演概要集 63- (2) 516 -516 2008/08/25 [Not refereed][Not invited]
- 金田寛, 渡辺肇, 後藤輝孝, 根本祐一, 昆金正敏, 柳澤達也, 中村慎太郎 応用物理学関係連合講演会講演予稿集 55th- (1) 447 2008/03/27 [Not refereed][Not invited]
- 渡邊肇, 後藤輝孝, 金田寛, 根本祐一, 昆金正敏, 柳澤達也, 中村慎太郎 応用物理学関係連合講演会講演予稿集 55th- (2) 816 2008/03/27 [Not refereed][Not invited]
- 後藤輝孝, 小林陽樹, 都竹星志, 渡辺智行, 鈴木修, 柳沢達也, 根本祐一, 武田直也, DOENNI Andreas, 北澤英明 日本物理学会講演概要集 63- (1) 527 2008/02/29 [Not refereed][Not invited]
- 小林陽樹, 都竹星志, 鈴木修, 柳沢達也, 根本祐一, 後藤輝孝, 武田直也, DOENNI Andreas, 北澤英明 日本物理学会講演概要集 63- (1) 528 2008/02/29 [Not refereed][Not invited]
- Araki K, Goto T, Nemoto Y, Yanagisawa T, Luthi Bruno Meeting abstracts of the Physical Society of Japan 63- (1) 549 -549 2008/02/29 [Not refereed][Not invited]
- Yamada-Kaneta Hiroshi, Watanabe Hajime, Hikin Masatoshi, Goto Terutaka, Nemoto Yuichi, Yanagisawa Tatsuya, Nakamura Shintaro Meeting abstracts of the Physical Society of Japan 63- (1) 936 -936 2008/02/29 [Not refereed][Not invited]
- Watanabe Hajime, Goto Terutaka, Yamada-Kaneta Hiroshi, Nemoto Yuichi, Hikin Masatoshi, Yanagisawa Tatsuya, Nakamura Shintaro Meeting abstracts of the Physical Society of Japan 63- (1) 936 -936 2008/02/29 [Not refereed][Not invited]
- Yasumoto Y, Yamaguchi A, Yanagisawa T, Nemoto Y, Goto T, Ochiai A Meeting abstracts of the Physical Society of Japan 63- (1) 567 -567 2008/02/29 [Not refereed][Not invited]
- Tachikawa Y, Kobayashi H, Tsuduku S, Ano G, Yanagisawa T, Nemoto Y, Goto T, Takeda N, Donni Andreas, Kitazawa H Meeting abstracts of the Physical Society of Japan 63- (1) 549 -549 2008/02/29 [Not refereed][Not invited]
- Tsuduku S, Kobayashi H, Tachikawa Y, Suzuki O, Yanagisawa T, Nemoto Y, Goto T, Takeda N, Donni Andress, Kitazawa H Meeting abstracts of the Physical Society of Japan 63- (1) 549 -549 2008/02/29 [Not refereed][Not invited]
- Yanagisawa T, Yasumoto Y, Yamaguchi A, Nemoto Y, Goto T, Sayles T.A, Yuhasz W.M, Paglione J, Jeffries J.R, Maple M.B, Henkie Z, Pietraszko A, Cichorek T, Wawryk R Meeting abstracts of the Physical Society of Japan 63- (1) 538 -538 2008/02/29 [Not refereed][Not invited]
- Kobayashi H, Tsuduku S, Suzuki O, Yanagisawa T, Nemoto Y, Goto T, Takeda N, Donni Andreas, Kitazawa H Meeting abstracts of the Physical Society of Japan 63- (1) 528 -528 2008/02/29 [Not refereed][Not invited]
- Goto T, Kobayashi H, Tsuduku S, Watanabe T, Suzuki O, Yanagisawa T, Nemoto Y, Takeda N, Donni Andreas Meeting abstracts of the Physical Society of Japan 63- (1) 527 -527 2008/02/29 [Not refereed][Not invited]
- 都竹星志, 小林陽樹, 立川喜章, 鈴木修, 柳澤達也, 根本祐一, 後藤輝孝, 武田直也, DOENNI Andress, 北澤英明 日本物理学会講演概要集 63- (1) 549 2008/02/29 [Not refereed][Not invited]
- 金田寛, 渡辺肇, 昆金正敏, 後藤輝孝, 根本祐一, 柳澤達也, 中村慎太郎 日本物理学会講演概要集 63- (1) 936 -936 2008/02/29 [Not refereed][Not invited]
- 安本百合, 山口高央, 柳澤達也, 根本祐一, 後藤輝孝, 落合明 日本物理学会講演概要集 63- (1) 567 -567 2008/02/29 [Not refereed][Not invited]
- 渡邊肇, 後藤輝孝, 金田寛, 根本祐一, 昆金正敏, 柳澤達也, 中村慎太郎 日本物理学会講演概要集 63- (1) 936 -936 2008/02/29 [Not refereed][Not invited]
- 柳澤達也, 安本百合, 山口高央, 根本祐一, 後藤輝孝, SAYLES T. A, YUHASZ W. M, PAGLIONE J, JEFFRIES J. R, MAPLE M. B, HENKIE Z, PIETRASZKO A, CICHOREK T, WAWRYK R 日本物理学会講演概要集 63- (1) 538 2008/02/29 [Not refereed][Not invited]
- 立川喜章, 小林陽樹, 都竹星志, 阿野元貴, 柳澤達也, 根本祐一, 後藤輝孝, 武田直也, DOENNI Andreas, 北澤英明 日本物理学会講演概要集 63- (1) 549 2008/02/29 [Not refereed][Not invited]
- 荒木幸治, 後藤輝孝, 根本祐一, 柳澤達也, LUETHI Bruno 日本物理学会講演概要集 63- (1) 549 2008/02/29 [Not refereed][Not invited]
- 昆金正敏, 後藤輝孝, 金田寛, 根本祐一, 渡邉肇, 柳澤達也, 中村慎太郎 応用物理学会学術講演会講演予稿集 68th- (1) 433 2007/09/04 [Not refereed][Not invited]
- Yanagisawa T, Yasumoto Y, Yamaguchi A, Nemoto Y, Goto T, Yuhasz William M, Ho Pei-Chun, Maple M.Brian Meeting abstracts of the Physical Society of Japan 62- (2) 515 -515 2007/08/21 [Not refereed][Not invited]
- Nemoto Y, Yasumoto Y, Yamaguchi A, Yanagisawa T, Goto T, Takeda N, Ochiai A, Sugawara H, Sato H Meeting abstracts of the Physical Society of Japan 62- (2) 515 -515 2007/08/21 [Not refereed][Not invited]
- Yasumoto Y, Watanabe H, Yanagisawa T, Yamaguchi A, Nemoto Y, Goto T, Ochiai A Meeting abstracts of the Physical Society of Japan 62- (2) 576 -576 2007/08/21 [Not refereed][Not invited]
- Hikin Masatoshi, Goto Terutaka, Yamada-Kaneta Hiroshi, Nemoto Yuichi, Watanabe Hajime, Yanagisawa Tatsuya, Nakamura Shintaro Meeting abstracts of the Physical Society of Japan 62- (2) 994 -994 2007/08/21 [Not refereed][Not invited]
- Goto Terutaka, Yamada-Kaneta Hiroshi, Hikin Masatoshi, Nemoto Yuichi, Watanabe Hajime, Yanagisawa Tatsuya, Nakamura Shintaro Meeting abstracts of the Physical Society of Japan 62- (2) 993 -993 2007/08/21 [Not refereed][Not invited]
- 後藤輝孝, 金田寛, 昆金正敏, 根本祐一, 渡邊肇, 柳澤達也, 中村慎太郎 日本物理学会講演概要集 62- (2) 993 -993 2007/08/21 [Not refereed][Not invited]
- 柳澤達也, 安本百合, 山口高央, 根本祐一, 後藤輝孝, YUHASZ William M, HO Pei‐Chun, MAPLE M. Brian 日本物理学会講演概要集 62- (2) 515 2007/08/21 [Not refereed][Not invited]
- 根本祐一, 安本百合, 山口高央, 柳澤達也, 後藤輝孝, 武田直也, 落合明, 菅原仁, 佐藤英行 日本物理学会講演概要集 62- (2) 515 -515 2007/08/21 [Not refereed][Not invited]
- 安本百合, 渡邊彦睦, 柳澤達也, 山口高央, 根本祐一, 後藤輝孝, 落合明 日本物理学会講演概要集 62- (2) 576 2007/08/21 [Not refereed][Not invited]
- 昆金正敏, 後藤輝孝, 金田寛, 根本祐一, 渡邊肇, 柳澤達也, 中村慎太郎 日本物理学会講演概要集 62- (2) 994 -994 2007/08/21 [Not refereed][Not invited]
- Nemoto Y, Watanabe H, Yasumoto Y, Goto T, Yanagisawa T, Takeda N, Ochiai A, Susawara H, Sato H Meeting abstracts of the Physical Society of Japan 62- (1) 613 -613 2007/02/28 [Not refereed][Not invited]
- Watanabe H, Nemoto Y, Takeda N, Yanagisawa T, Goto T, Ochiai A, Yoshino K, Sugawara H, Sato H Meeting abstracts of the Physical Society of Japan 62- (1) 523 -523 2007/02/28 [Not refereed][Not invited]
- Yasumoto Y, Watanabe H, Yanagisawa T, Nemoto Y, Goto T, Yuhasz W. M, Sales T. A, Ho P.-C, Maple M. B, Henkie Z, Pietraszko A Meeting abstracts of the Physical Society of Japan 62- (1) 520 -520 2007/02/28 [Not refereed][Not invited]
- Yuhasz W.M, Maple M.Brian, Henkie Z, Pietraszko A Meeting abstracts of the Physical Society of Japan 61- (2) 483 -483 2006/08/18 [Not refereed][Not invited]
- Watanabe H, Nemoto Y, Takeda N, Yanagisawa T, Goto T, Ochiai A, Yoshino K, Sugawara H, Sato H Meeting abstracts of the Physical Society of Japan 61- (2) 408 -408 2006/08/18 [Not refereed][Not invited]
- Suzuki K, Sato G, Mizuhashi T, Hataya T, Hara M, Watanuki R, Tamura H, Sakakibara T, Ishihara M, Yanagisawa T, Nemoto Y, Goto T, Ohyama K, Yamaguchi Y, Duijn J.Van, Attfield J.P Meeting abstracts of the Physical Society of Japan 61- (1) 429 -429 2006/03/04 [Not refereed][Not invited]
- Nemoto Y, Ishihara M, Yanagisawa T, Goto T, Watanuki R, Suzuki K Meeting abstracts of the Physical Society of Japan 61- (1) 430 -430 2006/03/04 [Not refereed][Not invited]
- Watanabe H, Ueno T, Nemoto Y, Takeda N, Yanagisawa T, Goto T, Sugawara H, Sato H Meeting abstracts of the Physical Society of Japan 61- (1) 601 -601 2006/03/04 [Not refereed][Not invited]
- Ito H, Yanagisawa T, Nemoto Y, Goto T, Onuki Y Meeting abstracts of the Physical Society of Japan 61- (1) 609 -609 2006/03/04 [Not refereed][Not invited]
- Ueno T, Nemoto Y, Takeda N, Yanagisawa T, Goto T, Sugawara H, Sato H Meeting abstracts of the Physical Society of Japan 61- (1) 578 -578 2006/03/04 [Not refereed][Not invited]
- Nemoto Y, Ueno T, Takeda N, Yanagisawa T, Goto T, Sugawara H, Sato H Meeting abstracts of the Physical Society of Japan 60- (2) 362 -362 2005/08/19 [Not refereed][Not invited]
- Yanagisawa T, Yuhasz W. M, Maple M. B, Ueno T, Nemoto Y, Goto T Meeting abstracts of the Physical Society of Japan 60- (2) 363 -363 2005/08/19 [Not refereed][Not invited]
- Ueno T, Nemoto Y, Takeda N, Yanagisawa T, Goto T, Sugawara H, Sato H Meeting abstracts of the Physical Society of Japan 60- (2) 397 -397 2005/08/19 [Not refereed][Not invited]
- Ito H, Yanagisawa T, Nemoto Y, Goto T, Onuki Y Meeting abstracts of the Physical Society of Japan 60- (2) 405 -405 2005/08/19 [Not refereed][Not invited]
- Ryuta Watanuki, Gou Sato, Kazuya Suzuki, Masaki Ishihara, Tatsuya Yanagisawa, Yuichi Nemoto, Terutaka Goto Meeting abstracts of the Physical Society of Japan 61- (1) 2005/06/23 [Not refereed][Not invited]
Physical properties of DyB$_4$ have been studied by magnetization, specific heat, and ultrasonic measurements. The magnetic entropy change and the ultrasonic properties in the intermediate phase II indicate that the degeneracy of internal degrees of freedom is not fully lifted in spite of the formation of magnetic order. The ultrasonic attenuation and the huge softening of $C_{44}$ in phase II suggests existence of electric-quadrupolar (orbital) fluctuations of the 4$f$-electron. These unusual properties originate from the geometrical quadrupolar frustration. - Goto T, Yamaguchi T, Nemoto Y, Ueno T, Yanagisawa T, Takeda N, Suzuki O, Kitazawa H, Sugawara H, Satoh H Meeting abstracts of the Physical Society of Japan 60- (1) 925 -925 2005/03/04 [Not refereed][Not invited]
- Ishihara M, Jumonji S, Yanagisawa T, Nemoto Y, Goto T, Watanuki R, Sakakibara T, Suzuki K Meeting abstracts of the Physical Society of Japan 60- (1) 542 -542 2005/03/04 [Not refereed][Not invited]
- Nemoto Y, Ueno T, Yamaguchi T, Yanagisawa T, Goto T, Takeda N, Sugawara H, Satoh H Meeting abstracts of the Physical Society of Japan 60- (1) 550 -550 2005/03/04 [Not refereed][Not invited]
- Goto T, Yamaguchi T, Nemoto Y, Ueno T, Yanagisawa T, Takeda N, Suzuki O, Kitazawa H, Sugawara H, Satoh H Meeting abstracts of the Physical Society of Japan 60- (1) 925 -925 2005/03/04 [Not refereed][Not invited]
- Yanagisawa T, Goto T, Nemoto Y, Watanuki R, Suzuki K Meeting abstracts of the Physical Society of Japan 59- (2) 423 -423 2004/08/25 [Not refereed][Not invited]
- Ishihara M, Yanagisawa T, Nemoto Y, Goto T, Watanuki R, Sakakibara T, Suzuki K Meeting abstracts of the Physical Society of Japan 59- (2) 568 -568 2004/08/25 [Not refereed][Not invited]
- Goto T, Onuki K, Sakai K, Nemoto Y, Yamaguchi T, AKatu M, Yanagisawa T, Sugawara H, Sato H Meeting abstracts of the Physical Society of Japan 59- (1) 610 -610 2004/03/03 [Not refereed][Not invited]
- Ishihara M, Yanagisawa T, Nemoto Y, Goto T, Watanuki R, Satou G, Mizuhashi T, Suzuki K Meeting abstracts of the Physical Society of Japan 59- (1) 614 -614 2004/03/03 [Not refereed][Not invited]
- Yanagisawa T, Moriwaki T, Goto T, Nemoto Y, Watanuki R, Suzuki K, Suzuki O, Kido G Meeting abstracts of the Physical Society of Japan 59- (1) 644 -644 2004/03/03 [Not refereed][Not invited]
- Watanuki R, Sato G, Suzuki K, Ohoyama K, Yamaguchi Y, Ishihara M, Yanagisawa T, Nemoto Y, Goto T Meeting abstracts of the Physical Society of Japan 59- (1) 651 -651 2004/03/03 [Not refereed][Not invited]
- Ozeki F, Yanagisawa T, Nemoto Y, Goto T, Kaneko K, Onodera H, Yamaguchi Y Meeting abstracts of the Physical Society of Japan 58- (2) 462 -462 2003/08/15 [Not refereed][Not invited]
- Moriwaki T, Yanagisawa T, Nemoto Y, Goto T, Watanuki R, Suzuki K Meeting abstracts of the Physical Society of Japan 58- (2) 462 -462 2003/08/15 [Not refereed][Not invited]
- 柳澤 達也, 森脇 達也, 後藤 輝孝, 根本 祐一, 綿貫 竜太, 鈴木 和也, 鈴木 修, 木戸 義勇 日本物理学会講演概要集 58- (2) 463 -463 2003/08/15 [Not refereed][Not invited]
- Kishi E, Tobo A, Yanagisawa T, Nemoto Y, Goto T, Yamauchi H, Ohoyama K, Onodera H Meeting abstracts of the Physical Society of Japan 58- (2) 489 -489 2003/08/15 [Not refereed][Not invited]
- Yamaguchi T, Nemoto Y, Akatsu M, Yanagisawa T, Goto T, Suzuki O, Kitazawa H Meeting abstracts of the Physical Society of Japan 58- (2) 490 -490 2003/08/15 [Not refereed][Not invited]
- Goto T, Nemoto Y, Sakai K, Yamaguchi T, Akatsu M, Yanagisawa T, Hazama H, Onuki K, Sugawara H, Sato H Meeting abstracts of the Physical Society of Japan 58- (2) 499 -499 2003/08/15 [Not refereed][Not invited]
- 柳澤 達也, 根本 祐一, 後藤 輝孝, 綿貫 竜太, 鈴木 和也 物性研究 79- (6) 1024 -1025 2003/03/20 [Not refereed][Not invited]
この論文は国立情報学研究所の電子図書館事業により電子化されました。 - Yanagisawa T, Kimura K, Goto T, Nemoto Y, Watanuki R, Suzuki K Meeting abstracts of the Physical Society of Japan 58- (1) 553 -553 2003/03/06 [Not refereed][Not invited]
- Kishi E, Tobo A, Onimaru T, Sakakibara T, Yanagisawa T, Nemoto Y, Goto T, Yamauchi H, Ohoyama K, Onodera H, Yamaguchi Y Meeting abstracts of the Physical Society of Japan 58- (1) 554 -554 2003/03/06 [Not refereed][Not invited]
- Kimura K, Yanagisawa T, Nemoto Y, Goto T, Miyata S, Watanuki R, Suzuki K Meeting abstracts of the Physical Society of Japan 57- (2) 442 -442 2002/08/13 [Not refereed][Not invited]
- Yanagisawa T, Goto T, Nemoto Y, M Shingo, Watanuki R, Suzuki K, Kaneko K, Onodera H, Yamaguchi Y Meeting abstracts of the Physical Society of Japan 57- (2) 522 -522 2002/08/13 [Not refereed][Not invited]
- Nemoto Y, Yanagisawa T, Goto T, Miyata S, Watanuki R, Suzuki K Meeting abstracts of the Physical Society of Japan 57- (1) 480 -480 2002/03/01 [Not refereed][Not invited]
- Hyodo K, Nemoto Y, Yanagisawa T, Goto T, Miyata S, Watanuki R, Suzuki K, Kaneko K, Onodera H, Yamaguchi Y Meeting abstracts of the Physical Society of Japan 57- (1) 480 -480 2002/03/01 [Not refereed][Not invited]
- 柳澤 達也 物性研究 77- (2) 391 -438 2001/11/20 [Not refereed][Not invited]
この論文は国立情報学研究所の電子図書館事業により電子化されました。 - Yanagisawa T, Nemoto Y, Goto T, Onuki Y Meeting abstracts of the Physical Society of Japan 56- (2) 472 -472 2001/09/03 [Not refereed][Not invited]
- Yanagisawa T, Nemoto Y, Goto T, Onuki Y Meeting abstracts of the Physical Society of Japan 56- (1) 493 -493 2001/03/09 [Not refereed][Not invited]
- Yanagisawa T, Nemoto Y, Goto T, Onuki Y Meeting abstracts of the Physical Society of Japan 55- (2) 523 -523 2000/09/10 [Not refereed][Not invited]
- Yanagisawa T, Nemoto Y, Goto T, Onuki Y Meeting abstracts of the Physical Society of Japan 55- (1) 505 -505 2000/03/10 [Not refereed][Not invited]
Presentations
- Observation of Multipoles in the Solid State using Ultrasound [Invited]Tatsuya YanagisawaNational Taiwan Normal University Physics Colloquium 2024/03
- Observation of Electric Multipoles in the Solid State by Means of Ultrasound [Invited]Tatsuya YanagisawaHokkaido University - NIMS Joint Graduate School Program, Student Seminar 2023/12
- Advantages of Ultrasonic Measurements using High-magnetic Field Environment [Invited]Tatsuya Yanagisawa強磁場科学研究会「強磁場研究における次世代ネットワーク形成とサイエンスの新展開」 2023/12
- Ultrasonic properties of asymmetric uranium compounds [Invited]Tatsuya YanagisawaH-Physics workshop: Topology, spin-orbit interactions and superconductivity in strongly correlated quantum materials under extreme conditions 2023/10
- Lattice Instability of UTe2 studied by Ultrasonic MeasurementsTatsuya YanagisawaHLD institute seminar 2023/01
- 音波と極低温で見る量子状態 [Invited]柳澤達也日本物理教育学会北海道支部総会 2022/12
- A Study of elastic properties of UTe2 under high magnetic field [Invited]Tatsuya YanagisawaGIMRT, REIMEI and IRN Aperiodic joint international workshop "Superconductivity, Structural Complexity and Topology of UTe2 and Aperiodic Crystals" 2022/12
- 四極子感受率によるアシンメトリ量子物質の研究 [Invited]柳澤達也NUQセミナー（新潟大学大学院自然科学研究科） 2022/11
- Tatsuya YanagisawaThe 15th Asia Pacific Physics Conference (APPC15) 2022/08
- Tatsuya YanagisawaInternational Conference on Strongly Correlated Electron Systems (SCES2022) 2022/07 Amsterdam
- Research on the Quadrupolar Kondo Effect via Ultrasonic Measurements [Invited]Tatsuya YanagisawaPhysics Colloquium Series, California State University, Fresno, California 2022/05
- Magnetic Rotation Effect on the Elastic Response of URu2Si2 under High Magnetic Field [Not invited]Tatsuya YanagisawaJPS Fall Meeting 2021 2021/09 オンライン 日本物理学会
22pH2-14 - Tatsuya YanagisawaTopical meeting on Condensed-matter Chemistry on Actinides: The Kumatori meeting 2021 2021/02
- Research on the Formation and Ordering of the Augmented Multipoles via Ultrasonic Measurements [Invited]Tatsuya YanagisawaJoint Symposium of School of Science & WPI-ICReDD in Hokkaido Univ. 2020/12
- Research on the Unconventional Kondo Effect and Multipolar Ordering via Quadrupolar Susceptibility [Invited]Tatsuya YanagisawaAsia-Pacific Conference on Research in High Magnetic Fields 2020 2020/12
- 四極子感受率による拡張多極子の形成と秩序化の研究 [Invited]柳澤 達也ISSPワークショップ「量子物質研究の最近の進展と今後の展望」 2020/09
- Tatsuya YanagisawaInternational Conference on Strongly Correlated Electron Systems (SCES2019) 2019/09 Okayama Convention Center
- Tatsuya YanagisawaJ-Physics 2019 International Conference 2019/09 Kobe Univ.
- 単サイト四極子近藤効果の傍証：Y1−xPrxIr2Zn20の弾性応答 [Not invited]柳澤達也J-Physics 地域研究会 ー 札幌 2019/07 Hokkaido Univ.
- (Y,Pr)Ir2Zn20 の弾性応答に観る対数的温度変化と四極子近藤効果の連関 [Invited]柳澤達也J-Physics 地域研究会 ‐ 本郷 2019/06 Univ. of Tokyo
- Γ3 非クラマース二重項を持つ希釈極限系(Y,Pr) Ir2Zn20 における四極子感受率の対数的温度変化 [Not invited]柳澤達也J-Physics 地域研究会 ー 北九州 2019/06 九州工業大学戸畑キャンパス MILAiS
- UAu2Si2の強磁場に於ける弾性特性 [Not invited]柳澤達也, 日高宏之, 網塚浩, 齋藤開, 田端千紘, GORBUNOV D, 野村肇宏, ZHERLITSYN S, WOSNITZA J, UHLIROVA K, VALISKA M, SECHOVSKY V日本物理学会講演概要集(CD-ROM) 2019/03
- TbNiC2における負の磁気応答の観測 [Not invited]山本将隆, 日高宏之, 柳澤達也, 田端千紘, 中尾裕則, 下村晋, 小野寺秀也, 網塚浩日本物理学会講演概要集(CD-ROM) 2019/03
- CeRu2Al10における電流誘起磁化 [Not invited]高力暁成, 山本将隆, 鹿内奈南, 齋藤開, 田端千紘, 日高宏之, 柳澤達也, 網塚浩, 谷田博司, 松村武, 世良正文日本物理学会講演概要集(CD-ROM) 2019/03
- RBe13(R:軽希土類)のX線非弾性散乱 [Not invited]筒井智嗣, 清水悠晴, 日高宏之, 長谷川巧, 柳澤達也, 網塚浩日本物理学会講演概要集(CD-ROM) 2019/03
- EuBe13におけるEu価数状態と低エネルギーフォノン [Not invited]日高宏之, 水内康太, 柳澤達也, 網塚浩日本物理学会講演概要集(CD-ROM) 2019/03
- 単サイト四極子近藤効果の傍証:(Y,Pr)Ir2Zn20 の弾性応答 [Not invited]柳澤達也新学術領域研究J-Physics: C01トピカルミーティング「拡張多極子物性研究の現状と展望 2019/01 明治大学駿河台キャンパス グローバルフロント2階 4021 号室
- 籠状構造を有するRBe13のNMRによる研究 [Not invited]與儀護, 久保田史洋, 比嘉野乃花, 上原弘敬, 水内康太, 日高宏之, 柳澤達也, 網塚浩日本物理学会講演概要集(CD-ROM) 2018/09
- UAu2Si2の強磁場に於ける弾性特性 [Not invited]柳澤達也, 日高宏之, 網塚浩, 齋藤開, 田端千紘, GORBUNOV D, 野村肇宏, ZHERLITSYN S, WOSNITZA J, UHLIROVA K, VALISKA M, SECHOVSKY V日本物理学会講演概要集(CD-ROM) 2018/09
- TbNiC2における磁化反転異常 [Not invited]山本将隆, 日高宏之, 柳澤達也, 田端千紘, 中尾裕則, 下村晋, 小野寺秀也, 網塚浩日本物理学会講演概要集(CD-ROM) 2018/09
- 静水圧下における超音波測定によるCeTeの四極子応答の研究 [Not invited]斎藤猛敬, 松盛泰明, 日高宏之, 柳澤達也, 網塚浩, 林佑弥, 松村武, 中村慎太郎, 落合明日本物理学会講演概要集(CD-ROM) 2018/09
- Ce(Ru1-xRhx)2Al10(x=0,0.05)における電流誘起磁化 [Not invited]高力暁成, 山本将隆, 鹿内奈南, 齋藤開, 田端千紘, 日高宏之, 柳澤達也, 網塚浩, 谷田博司, 松村武, 世良正文日本物理学会講演概要集(CD-ROM) 2018/09
- カゴ状化合物MBe13における低励起フォノンとf電子状態 [Not invited]日高宏之, 山崎聖悟, 永田涼馬, 水内康太, 三浦植幸, 門別翔太, 田端千紘, 清水悠晴, 柳澤達也, 網塚浩日本物理学会講演概要集(CD-ROM) 2018/09
- 電流と格子回転・歪みによる複合共役場を用いた拡張多極子 検出の試み [Not invited]柳澤達也J-Physics:多極子伝導系の物理 平成 30 年度領域全体会議 2018/05 東北大学片平さくらホール
- 非磁性Eu化合物EuBe13のNMRによる研究 [Not invited]比嘉野乃花, 久保田史洋, 上原弘敬, 與儀護, 水内康太, 日高宏之, 柳澤達也, 網塚浩日本物理学会講演概要集(CD-ROM) 2018/03
- UNi4Bの極低温・強磁場における超音波弾性応答 [Not invited]柳澤達也, 齋藤開, 日高宏之, 網塚浩, 中村慎太郎, 淡路智, GORBUNOV Denis, ZHERLITSYN Sergei, WOSNITZA Jochen, UHLIROVA Klara, VALISKA Michal, SECHOVSKY Vladimir日本物理学会講演概要集(CD-ROM) 2018/03
- 局所空間反転対称性の破れたCe(Ru1-xRhx)2Al10における電気磁気効果 II [Not invited]鹿内奈南, 網塚浩, 齋藤開, 山本将隆, 日高宏之, 柳澤達也, 谷田博司, 松村武, 世良正文日本物理学会講演概要集(CD-ROM) 2018/03
- 金属反強磁性体CeRh2Si2における電流誘起磁化現象 [Not invited]齋藤開, 鈴木悠介, 鹿内奈南, 三浦植幸, 日高宏之, 柳澤達也, 田端千紘, 網塚浩日本物理学会講演概要集(CD-ROM) 2018/03
- 9Be NMR測定によるSmBe13の磁気構造の研究 II [Not invited]日高宏之, 井原慶彦, 山崎聖悟, 三浦植幸, 柳澤達也, 網塚浩日本物理学会講演概要集(CD-ROM) 2018/03
- UNi4Bのトロイダル磁気秩序における電流下超音波測定 [Not invited]柳澤達也, 松盛泰明, 斎藤猛敬, 齋藤開, 日高宏之, 網塚浩日本物理学会講演概要集(CD-ROM) 2017/09
- 軽希土類系RBe13における4f電子状態と低励起フォノンに関する系統的研究 [Not invited]日高宏之, 山崎聖悟, 永田涼馬, 水内康太, 三浦植幸, 門別翔太, 田端千紘, 清水悠晴, 柳澤達也, 網塚浩日本物理学会講演概要集(CD-ROM) 2017/09
- URu2Si2の隠れた秩序における4回回転対称性の検証 [Not invited]立松愛梨, 日高宏之, 柳澤達也, 網塚浩, 仲村愛, 本間佳哉, 本多史憲, 青木大日本物理学会講演概要集(CD-ROM) 2017/09
- 磁場中超音波測定によるCeTeの四極子応答の研究 [Not invited]斎藤猛敬, 松盛泰明, 日高宏之, 柳澤達也, 網塚浩, 林佑弥, 松村武, 落合明日本物理学会講演概要集(CD-ROM) 2017/09
- 局所空間反転対称性の破れたCe(Ru1-xRhx)2Al10における電気磁気効果 [Not invited]鹿内奈南, 齋藤開, 日高宏之, 柳澤達也, 網塚浩, 谷田博司, 松村武, 世良正文日本物理学会講演概要集(CD-ROM) 2017/09
- Observation of Multipoles in the Solid State by Means of Ultrasound [Invited]Tatsuya YanagisawaPhysics Colloquium Series 2017/09 California State University, Fresno, McLane 162
- Observation of Multipoles in the Solid State by Means of Ultrasound [Invited]Tatsuya YanagisawaPhysics and Astronomy Department Colloquium Series 2017/09 California State University, Los Angeles, BIOS 335
- UAu2Si2の磁気構造解析 [Not invited]田端千紘, KLICPERA Milan, KLICPERA Milan, OULADDIAF Bachir, 齋藤開, VALISKA Michal, UHLIROVA Klara, SECHOVSKY Vladimir, 日高宏之, 柳澤達也, 網塚浩日本物理学会講演概要集(CD-ROM) 2017/03
UAu_2_Si_2_はThCr_2_Si_2_型体心正方晶をとり、過去の報告によれば19 K で強磁性秩序を起こす物質とされていたが、磁気構造等の微視的な情報は得られていなかった。講演者らは本物質の単結晶試料の作製に初めて成功し、この物質の秩序の本質が反強磁性であることをマクロ物性測定およびNMR測定から明らかにしてきた。とくにNMRスペクトルからはq=(2/3,0,0)の秩序波数を予想しており、最近、これを直接確かめるため中性子回折実験を行った。実験の結果、確かにq=(2/3,0,0)で磁気反射が19 K 以下で発達する様子を観測し、本物質がUの1-2-2系化合物で唯一、零磁場で[100]方向の秩序波数を持つ物質であることを明らかにした。
- UNi4Bの単結晶育成及び電流下磁化の試料依存性 [Not invited]齋藤開, 三浦植幸, 日高宏之, 柳澤達也, 網塚浩, 田端千紘, VALISKA Michal, UHLIROVA Klara, PLOKLESKA Jan, SECHOVSKY Vladimir日本物理学会講演概要集(CD-ROM) 2017/03
UNi_4_BはT_N_ = 20.4 Kで渦状の磁気秩序を示す。T_N_での秩序はトロイダル秩序の候補として注目されている。これに関する検証を進める上では結晶、磁気構造の正確な把握が重要である。本研究では中性子散乱実験に先立ち、チェコのカレル大学において、これまでの報告と異なる方法で育成したUNi_4_B単結晶の育成方法を紹介する。また、この試料に対して行った電流化磁化測定の結果も報告する予定である。
- 9Be NMR測定によるSmBe13の磁気構造の研究 [Not invited]井原慶彦, 大沼晃弘, 山崎聖悟, 三浦植幸, 日高宏之, 柳澤達也, 網塚浩日本物理学会講演概要集(CD-ROM) 2017/03
希土類化合物SmBe13は3価のSmが持つ4f電子が8.3 Kで磁気秩序を起こす。磁化率の温度依存性から正のワイス温度が観測されている一方で、磁気秩序温度以下では磁化率の減少が見られており、反強磁性的磁気構造を持つと考えられる。HoSm13ではヘリカル構造を取ることが示唆されており、SmBe13も同様の磁気構造を持つ可能性が議論されている。そこで、微視的視点から磁気構造を明らかにするため9Be NMR測定を行ったのでその結果を報告する。
- UNi4Bのトロイダル磁気秩序における磁場中超音波弾性応答 II [Not invited]松盛泰明, 門別翔太, 齋藤開, 柳澤達也, 日高宏之, 網塚浩日本物理学会講演概要集(CD-ROM) 2017/03
- RBe13における異常な電気抵抗温度依存性と低励起アインシュタインフォノンの関係 [Not invited]日高宏之, 水内康太, 山崎聖悟, 三浦植幸, 清水悠晴, 柳澤達也, 網塚浩日本物理学会講演概要集(CD-ROM) 2017/03
希土類化合物RBe13は約170K程度のアインシュタインフォノンを持つことが比熱測定などから明らかになっている。一方、磁性を持たないLaBe13やEuBe13、結晶場一重項基底状態をもつPrBe13では、低温で通常のデバイフォノン散乱では説明できない電気抵抗のT^3^温度依存性が共通して観測されている。講演ではアインシュタインフォンと異常な電気抵抗温度依存性の関係について報告する予定である。
- Matsumori H, Mombetsu S, Saito H, Yanagisawa T, Hidaka H, Amitsuka HMeeting Abstracts of the Physical Society of Japan 2017
UNi_4_Bは20 Kで磁気秩序を示し、その秩序は近年提唱されたトロイダル秩序の候補として注目されている。我々は超音波を用いてUNi_4_Bの弾性応答をT > 1.5 K, H < 17 Tの温度・磁場範囲で測定し、磁場−温度相図を得た。前回の講演に続き、今回は対称性の異なる横波超音波C_44_モードを用いた新たな実験結果を示し、結晶場解析の結果と磁気弾性結合について議論する。
- Saito Hiraku, Sechovský Vladimír, Miura Naoyuki, Hidaka Hiroyuki, Yanagisawa Tatsuya, Amitsuka Hiroshi, Tabata Chihiro, Vališka Michal, Uhliřová Klára, Prokleška JanMeeting Abstracts of the Physical Society of Japan 2017
- 三浦植幸, UHLIROVA Klara, PRCHAL Jiri, 田端千紘, SECHOVSKY Vladimir, 日高宏之, 柳澤達也, 網塚浩日本物理学会講演概要集(CD-ROM) 2016/09
- RBe13(R=希土類)の低温物性 [Not invited]水内康太, 永田涼馬, 三浦植幸, 日高宏之, 柳澤達也, 網塚浩日本物理学会講演概要集(CD-ROM) 2016/09
- 日高宏之, 水内康太, 三浦植幸, 瀬口泰生, 柳澤達也, 網塚浩日本物理学会講演概要集(CD-ROM) 2016/09
- 高温電気抵抗測定システムの開発と5f電子系への応用 [Not invited]高井真志穂, 田端千紘, 齋藤開, 日高宏之, 柳澤達也, 網塚浩日本物理学会講演概要集(CD-ROM) 2016/09
- UNi4Bのトロイダル磁気秩序における磁場中超音波弾性応答 [Not invited]松盛泰明, 酒井新, 門別翔太, 齋藤開, 柳澤達也, 日高宏之, 網塚浩日本物理学会講演概要集(CD-ROM) 2016/09
- 強磁性体CeCdの圧力誘起量子相転移 II [Not invited]新村省悟, 水内康太, 瀬口泰生, 齋藤開, 日高宏之, 柳澤達也, 網塚浩日本物理学会講演概要集(CD-ROM) 2016/09
- 静水圧力下におけるSmOs4Sb12の異常な超音波分散 [Not invited]門別翔太, 稲垣宏幸, 村住太郎, 日高宏之, 柳澤達也, 網塚浩, HO Pei‐Chun, MAPLE M. Brian日本物理学会講演概要集(CD-ROM) 2016/09
- カゴ状化合物RBe13(R=希土類,アクチノイド)の低温X線結晶構造解析 [Not invited]永田涼馬, 田端千紘, 水内康太, 清水悠晴, 三浦植幸, 山崎聖悟, 門別翔太, 日高宏之, 柳澤達也, 網塚浩日本物理学会講演概要集(CD-ROM) 2016/03
- UAu2Si2の29Si‐NMR測定 [Not invited]田端千紘, 井原慶彦, 新村省悟, 三浦植幸, 齋藤開, 日高宏之, 柳澤達也, 網塚浩日本物理学会講演概要集(CD-ROM) 2016/03
- X線後方散乱によるURu2Si2の隠れた秩序相における結晶4回回転対称性の検証 [Not invited]網塚浩, 田端千紘, 齋藤開, 柳澤達也, 日高宏之, 稲見俊哉, 青木大, 本多史憲, 本間佳哉, 仲村愛日本物理学会講演概要集(CD-ROM) 2016/03
- UNi4Bのトロイダル磁気秩序状態における電流磁気効果の検証 III [Not invited]齋藤開, 上西健太, 三浦植幸, 田端千紘, 日高宏之, 柳澤達也, 網塚浩日本物理学会講演概要集(CD-ROM) 2016/03
- 強磁性体CeCdの圧力誘起量子相転移 [Not invited]日高宏之, 瀬口泰生, 新村省悟, 齋藤開, 柳澤達也, 網塚浩日本物理学会講演概要集(CD-ROM) 2016/03
- URu2Si2の強磁場弾性応答 III [Not invited]柳澤達也, 門別翔太, 日高宏之, 網塚浩, CONG P. T, YASHIN S, ZHERLITSYN S, WOSNITZA J, HUANG K, KANCHANAVATEE N, JANOSCHEK M, MAPLE M. B, 青木大, 青木大日本物理学会講演概要集(CD-ROM) 2016/03
- 19aBL-4 ^<29>Si-NMR Study on UAu_2Si_2 [Not invited]Tabata C, Ihara Y, Shimmura S, Miura N, Saito H, Hidaka H, Yanagisawa T, Amitsuka H日本物理学会講演概要集 2016/03
- 重い電子系超伝導体U1-xThxBe13の超音波弾性応答 [Not invited]稲垣宏幸, 門別翔太, 清水悠晴, 柳澤達也, 日高宏之, 網塚浩, YAZICI D, MAPLE M.B, CONG P.T, ZHERLITSYN S, WOSNITZA J日本物理学会講演概要集(CD-ROM) 2015/09
- UAu2Si2の低温磁性 III [Not invited]田端千紘, 三浦植幸, UHLIROVA Klara, VALISKA Michal, SECHOVSKY Vladimir, 新村省悟, 齋藤開, 日高宏之, 柳澤達也, 井原慶彦, 網塚浩日本物理学会講演概要集(CD-ROM) 2015/09
- 籠状化合物PrNi2Cd20の弾性応答 [Not invited]柳澤達也, YAZICI D, WHITE B. D, MAPLE M. B, 門別翔太, 日高宏之, 網塚浩, CONG P. T, ZHERLITSYN S, WOSNITZA J日本物理学会講演概要集(CD-ROM) 2015/09
- 多軸回転機構を有した角度分解磁気トルク測定システムの開発 [Not invited]上西健太, 田端千紘, 立松愛梨, 瀬口泰生, 齋藤開, 三浦植幸, 日高宏之, 柳澤達也, 網塚浩日本物理学会講演概要集(CD-ROM) 2015/09
- CeAgにおける強四極子および強磁性秩序状態の圧力効果:高圧下磁化測定 [Not invited]日高宏之, 新村省悟, 瀬口泰生, 齋藤開, 大谷真也, 柳澤達也, 網塚浩日本物理学会講演概要集(CD-ROM) 2015/09
- 静水圧力下におけるSmOs4Sb12の高周波超音波弾性定数測定 II [Not invited]門別翔太, 稲垣宏幸, 村住太郎, 日高宏之, 柳澤達也, 網塚浩, HO Pei‐Chun, BRIANMAPLE M日本物理学会講演概要集(CD-ROM) 2015/09
- UNi4Bのトロイダル秩序がHall係数に与える寄与 [Not invited]齋藤開, 三浦植幸, 田端千紘, 日高宏之, 柳澤達也, 網塚浩日本物理学会講演概要集(CD-ROM) 2015/09
- カゴ状化合物RBe13(R=希土類)の低温X線構造解析 [Not invited]永田涼馬, 田端千紘, 三浦植幸, 山崎聖悟, 門別翔太, 水内康太, 清水悠晴, 日高宏之, 柳澤達也, 網塚浩日本物理学会講演概要集(CD-ROM) 2015/09
- 強磁性体CeCdにおける圧力効果 [Not invited]瀬口泰生, 田端千紘, 新村省悟, 永田涼馬, 齋藤開, 日高宏之, 柳澤達也, 網塚浩日本物理学会講演概要集(CD-ROM) 2015/09
- UAu2Si2の低温磁性 II [Not invited]田端千紘, 井原慶彦, 新村省悟, 齋藤開, 三浦植幸, 日高宏之, 柳澤達也, 網塚浩日本物理学会講演概要集(CD-ROM) 2015/03
- カゴ状化合物RBe13(R=希土類)の基礎物性 III [Not invited]日高宏之, 水内康太, 三浦植幸, 永田涼馬, 田端千紘, 柳澤達也, 網塚浩日本物理学会講演概要集(CD-ROM) 2015/03
- UNi4Bのトロイダル磁気秩序状態における電気磁気効果の検証 II [Not invited]齋藤開, 上西健太, 三浦植幸, 田端千紘, 日高宏之, 柳澤達也, 網塚浩日本物理学会講演概要集(CD-ROM) 2015/03
- 静水圧力下におけるSmOs4Sb12の高周波超音波弾性定数測定 [Not invited]門別翔太, 稲垣宏幸, 村住太郎, 日高宏之, 柳澤達也, 網塚浩, HO Pei‐Chun, MAPLE M. Brian日本物理学会講演概要集(CD-ROM) 2015/03
- 24aBE-8 Low-Temperature Magnetism of UAu_2Si_2 II [Not invited]Tabata C, Ihara Y, Shimmura S, Saito H, Miura N, Hidaka H, Yanagisawa T, Amitsuka H日本物理学会講演概要集 2015/03
- 16aDA-4 Low-Temperature Magnetism of UAu_2Si_2 III [Not invited]Tabata C, Ihara Y, Amitsuka H, Miura N, Uhlirova Klara, Valiska Michal, Sechovsky Vladimir, Shimmura S, Saito H, Hidaka H, Yanagisawa TMeeting Abstracts of the Physical Society of Japan 2015
- CeAgの温度‐圧力相図 [Not invited]日高宏之, 齋藤開, 大谷真也, 瀬口泰生, 柳澤達也, 網塚浩日本物理学会講演概要集 2014/08
- U3Pd20Si6の磁場中弾性応答 II [Not invited]日浦健太, 柳澤達也, 門別翔太, 村住太郎, 稲垣宏幸, 日高宏之, 網塚浩, 立岩尚之, 芳賀芳範日本物理学会講演概要集 2014/08
- UAu2Si2の低温磁性 [Not invited]田端千紘, 三浦植幸, 齋藤開, 瀬口泰生, 日高宏之, 柳澤達也, 網塚浩日本物理学会講演概要集 2014/08
- Matsuno H, Morita K, Kotegawa H, Tou H, Shimizu Y, Yanagisawa T, Amitsuka H, Haga Y, Yamamoto E, Onuki YMeeting abstracts of the Physical Society of Japan 2014/08
- Murazumi T, Inagaki H, Mombetsu S, Hidaka H, Yanagisawa T, Amitsuka HMeeting abstracts of the Physical Society of Japan 2014/08
- 9aBK-12 Low-Temperature Magnetic Properties of UAu_2Si_2 [Not invited]Tabata C, Miura N, Saito H, Seguchi T, Hidaka H, Yanagisawa T, Amitsuka HMeeting abstracts of the Physical Society of Japan 2014/08
- 9aBJ-12 Pressure-Temperature Phase Diagram in CeAg [Not invited]Hidaka H, Saito H, Otani S, Seguchi T, Yanagisawa T, Amitsuka HMeeting abstracts of the Physical Society of Japan 2014/08
- 10aBK-7 titletitle [Not invited]Hiura K, Yanagisawa T, Mombetsu S, Murazumi T, Inagaki H, Hidaka H, Amitsuka H, Tateiwa N, Haga YMeeting abstracts of the Physical Society of Japan 2014/08
- 9aBK-13 Tests for galvanomagnetic effect on a toroidal magnetic ordered state of UNi_4B [Not invited]Saito H, Uenishi K, Miura N, Tabata C, Matsumori H, Mizuuchi K, Hidaka H, Yanagisawa T, Amitsuka HMeeting abstracts of the Physical Society of Japan 2014/08
- 一軸圧力下におけるURu2Si2の超音波測定 [Not invited]村住太郎, 稲垣宏幸, 門別翔太, 日高宏之, 柳澤達也, 網塚浩日本物理学会講演概要集 2014/08
- UNi4Bのトロイダル磁気秩序状態における電流磁気効果の検証 [Not invited]齋藤開, 上西健太, 三浦植幸, 田端千紘, 松盛泰明, 水内康太, 日高宏之, 柳澤達也, 網塚浩日本物理学会講演概要集 2014/08
- カゴ状化合物LaBe13のNMRによる研究 [Not invited]松野治貴, 森田恭平, 小手川恒, 藤秀樹, 清水悠晴, 柳澤達也, 網塚浩, 芳賀芳範, 山本悦嗣, 大貫惇睦日本物理学会講演概要集 2014/08
- Ultrasonic Investigation of Magnetic Ordering with Higher-Order Interactions in the Cage-Structured Compound U3Pd20Si6 [Not invited]YANAGISAWA TatsuyaInternational Conference on Strongly Correlated Electron Systems (SCES2014) 2014/07
- Hidaka H, Yamazaki S, Shimizu Y, Miura N, Tabata C, Yanagisawa T, Amitsuka HMeeting abstracts of the Physical Society of Japan 2014/03
- URu2Si2の強磁場弾性応答 II [Not invited]柳澤達也, 門別翔太, 日高宏之, 網塚浩, 赤津光洋, YASIN Shadi, ZHERLITSYN Sergei, WOSNITZA Jochen, HUANG Kevin, JANOSCHEK M, MAPLE M. Brian日本物理学会講演概要集 2014/03
- UBe13の極低温におけるNMR・表面インピーダンスによる研究 [Not invited]松野治貴, 森田恭平, 小手川恒, 藤秀樹, 芳賀芳範, 山本悦嗣, 大貫惇睦, 清水悠晴, 柳澤達也, 網塚浩日本物理学会講演概要集 2014/03
- SmBe13のミュオンスピン緩和測定 [Not invited]田端千紘, 山崎聖悟, 伊藤孝, 髭本亘, 三浦植幸, 清水悠晴, 日高宏之, 柳澤達也, 網塚浩日本物理学会講演概要集 2014/03
- 27pBE-2 Muon Spin Relaxation Study of SmBe_<13> [Not invited]Tabata C, Yamazaki S, Ito T. U, Higemoto W, Miura N, Shimizu Y, Hidaka H, Yanagisawa T, Amitsuka HMeeting abstracts of the Physical Society of Japan 2014/03
- Matsuno H, Morita K, Kotegawa H, Tou H, Haga Y, Yamamoto E, Onuki Y, Shimizu Y, Yanagisawa T, Amitsuka HMeeting abstracts of the Physical Society of Japan 2014/03
- Yanagisawa T, Mombetsu S, Hidaka H, Amitsuka H, Akatsu M, Yasin Shaai, Zherlitsyn Sergei, Wasnitza Jochen, Huang Kevin, Janoschek M, Maple BrianMeeting abstracts of the Physical Society of Japan 2014/03
- カゴ状化合物RBe13(R=希土類)の基礎物性 II [Not invited]日高宏之, 山崎聖悟, 清水悠晴, 三浦植幸, 田端千紘, 柳澤達也, 網塚浩日本物理学会講演概要集 2014/03
- YANAGISAWA TatsuyaThe IMR-ASRC 4th REIMEI International Workshop (12th ASRC International Workshop) 2013/08
- カゴ状構造を持つSmBe13の低温物性 [Not invited]山崎聖悟, 清水悠晴, 齋藤開, 田端千紘, 門別翔太, 日高宏之, 柳澤達也, 網塚浩日本物理学会講演概要集 2013/03
- URu2Si2の強磁場弾性応答 [Not invited]柳澤達也, 門別翔太, 日高宏之, 網塚浩, 赤津光洋, 赤津光洋, YASIN Shadi, ZHERLITSYN Sergei, WOSNITZA Jochen, HUANG Kevin, MAPLE M. Brian日本物理学会講演概要集 2013/03
- U3Pd20Si6の磁場中弾性応答 [Not invited]日浦健太, 門別翔太, 日高宏之, 柳澤達也, 網塚浩, 立岩尚之, 芳賀芳範日本物理学会講演概要集 2013/03
- URu2Si2のX線構造解析 III [Not invited]田端千紘, 日高宏之, 柳澤達也, 横山淳, 網塚浩, 小林賢介, 熊井玲児, 中尾裕則, 村上洋一日本物理学会講演概要集 2013/03
- 強磁性体CeAgの圧力効果 III [Not invited]日高宏之, 齋藤開, 大谷真也, 巽かおり, 柳澤達也, 網塚浩日本物理学会講演概要集 2013/03
- PrOs4Sb12の非BCS型超伝導転移近傍における弾性定数と電気抵抗の同時測定 II [Not invited]門別翔太, 日浦健太, 日高宏之, 柳澤達也, 網塚浩, MAPLE M. B日本物理学会講演概要集 2013/03
- Mombetsu S, Hiura K, Hidaka H, Yanagisawa T, Amitsuka H, Maple M. BMeeting abstracts of the Physical Society of Japan 2012/08
- 18pGA-5 X-ray diffraction study of URu_2Si_2 II [Not invited]Tabata C, Miura N, Abiko K, Hidaka H, Yanagisawa T, Yokoyama M, Amitsuka H, Kobayashi K, Kumai R, Nakao H, Murakami YMeeting abstracts of the Physical Society of Japan 2012/08
- URu2Si2のX線構造解析 II [Not invited]田端千紘, 三浦植幸, 安孫子和弘, 日高宏之, 柳澤達也, 横山淳, 網塚浩, 小林賢介, 熊井玲児, 中尾裕則, 村上洋一日本物理学会講演概要集 2012/08
- 強磁性体CeAgの圧力効果 II [Not invited]大谷真也, 日高宏之, 巽かおり, 清水悠晴, 五十嵐英紀, 柳澤達也, 網塚浩日本物理学会講演概要集 2012/08
- PrOs4Sb12の非BCS型超伝導転移近傍における弾性定数と電気抵抗の同時測定 [Not invited]門別翔太, 日浦健太, 日高宏之, 柳澤達也, 網塚浩, MAPLE M. B日本物理学会講演概要集 2012/08
- 20pFH-5 Effects of Pressure on Ferromagnet CeAg II [Not invited]Otani S, Hidaka H, Tatsumi K, Shimizu Y, Igarashi H, Yanagisawa T, Amitsuka HMeeting abstracts of the Physical Society of Japan 2012/08
- Yanagisawa T, Mombetsu S, Hidaka H, Amitsuka H, Akatsu M, Yasin S, Zherlitsyn S, Wosnitza J, Huang K, Maple M. BMeeting abstracts of the Physical Society of Japan 2012/08
- Mombetsu S, Yanagisawa T, Hidaka H, Amitsuka H, Akatsu M, Nemoto Y, Goto T, Yashin S, Zherlitsyn S, Wosnitza JMeeting abstracts of the Physical Society of Japan 2012/03
- Igarashi H, Hidaka H, Shimizu Y, Tabata C, Yanagisawa T, Amitsuka HMeeting abstracts of the Physical Society of Japan 2012/03
- 25pYB-2 X-ray diffraction study of URu_2Si_2 [Not invited]Tabata C, Miura N, Abiko K, Hidaka H, Yanagisawa T, Yokoyama M, Amitsuka H, Kobayashi K, Kumai R, Nakao H, Murakami YMeeting abstracts of the Physical Society of Japan 2012/03
- 24pPSB-36 Pressure Effects of Ferromagnet CeAg [Not invited]Otani S, Hidaka H, Shimizu Y, Igarashi H, Yanagisawa T, Amitsuka HMeeting abstracts of the Physical Society of Japan 2012/03
- 24pYB-12 Effects of Pressure on Ce_3Pd_<20>Ge_6 [Not invited]Hidaka H, Otani S, Wakabayashi T, Shimizu Y, Amitsuka H, Yanagisawa T, Ramos S.M, Hering E.N, Fontes M.B, Saitovitch EMeeting abstracts of the Physical Society of Japan 2012/03
- 24pYB-7 Sb NMR study on single crystalline SmOs_4Sb_<12> [Not invited]Ihara Y, Fujii S, Mombetsu S, Yanagisawa TMeeting abstracts of the Physical Society of Japan 2012/03
- Yanagisawa T, Mombetsu S, Hidaka H, Amitsuka H, Akatsu M, Nemoto Y, Goto T, Yashin S, Zherlitsyn S, Wosnitza JMeeting abstracts of the Physical Society of Japan 2012/03
- Ce3Pd20Ge6の圧力効果 [Not invited]日高宏之, 大谷真也, 若林琢巳, 清水悠晴, 網塚浩, 柳澤達也, RAMOS S. M, HERING E. N, FONTES M. B, BAGGIO‐SAITOVITCH E日本物理学会講演概要集 2012/03
- パルス磁場を用いたSmOs4Sb12の超音波測定 [Not invited]門別翔太, 柳澤達也, 日高宏之, 網塚浩, 赤津光洋, 根本祐一, 後藤輝孝, YASHIN S, ZHERLITSYN S, WOSNITZA J日本物理学会講演概要集 2012/03
- URu2Si2のX線構造解析 [Not invited]田端千紘, 三浦植幸, 安孫子和弘, 日高宏之, 柳澤達也, 横山淳, 網塚浩, 小林賢介, 熊井玲児, 中尾裕則, 村上洋一日本物理学会講演概要集 2012/03
- SmOs4Sb12の強磁場下に於ける弾性応答 [Not invited]柳澤達也, 門別翔太, 日高宏之, 網塚浩, 赤津光洋, 根本祐一, 後藤輝孝, YASHIN S, ZHERLITSYN S, WOSNITZA J日本物理学会講演概要集 2012/03
- 重い電子系物質SmOs4Sb12単結晶におけるSb‐NMR測定 [Not invited]井原慶彦, 藤井俊介, 門別翔太, 柳澤達也日本物理学会講演概要集 2012/03
- UPd2Si2の非整合‐整合磁気秩序相における圧力下磁化測定 II [Not invited]五十嵐英紀, 日高宏之, 清水悠晴, 田端千紘, 柳澤達也, 網塚浩日本物理学会講演概要集 2012/03
- 強磁性体CeAgの圧力効果 [Not invited]大谷真也, 日高宏之, 清水悠晴, 五十嵐英紀, 柳澤達也, 網塚浩日本物理学会講演概要集 2012/03
- 共鳴X線散乱によるURu2Si2の隠れた秩序状態の解明 [Not invited]網塚浩, 田端千紘, 門別翔太, 柳澤達也, 横山淳, 桑原慶太郎, 須田山貴亮, 岡本淳, 山崎裕一, 中尾裕則, 村上洋一PFシンポジウム要旨集 2012
- 単結晶構造解析によるURu2Si2の隠れた秩序状態の解明 [Not invited]田端千紘, 三浦植幸, 安孫子和弘, 日高宏之, 柳澤達也, 横山淳, 網塚浩, 小林賢介, 熊井玲児, 中尾裕則, 村上洋一PFシンポジウム要旨集 2012
- Local Charge Fluctuation in the Atomic Cage [Invited]T. YanagisawaBrazil-Japan Mini Workshop on Heavy Electron Physics 2011/09
- Ultrasonic dispersions of non-magnetic origin in the unconventional heavy fermion system SmOs4Sb12 [Not invited]Tatsuya YanagisawaWorkshop「From Blue Pigment to Green energy: Cobolt mines - Skutterudites - Thermoelectrics」 2011/09
- URu2Si2のRh置換系における弾性応答 [Not invited]渡邊雄人, 齋藤旬, 日浦健太, 清水悠晴, 柳澤達哉, 日高宏之, 横山淳, 網塚浩日本物理学会講演概要集 2011/08
- Yanagisawa T, Monbetsu S, Hidaka H, Amitsuka H, Akatsu M, Araki K, Nemoto Y, Goto T, Ho Pei-Chun, Baumbach Ryan E, Maple M. BrianMeeting abstracts of the Physical Society of Japan 2011/08
- 23pGC-7 Magnetization Measurements of UPd_2Si_2 on Incommensurate and Commensurate Magnetic Phases under High Pressure [Not invited]Igarashi H, Hidaka H, Shimizu Y, Tabata C, Yanagisawa T, Amitsuka HMeeting abstracts of the Physical Society of Japan 2011/08
- 24aGC-7 Anomalous Magnetic Properties in the Superconducting Mixed State of the Heavy-Fermion Superconductor UBe_<13> [Not invited]Shimizu Y, Ikeda Y, Haga Y, Hidaka H, Yanagisawa T, Amitsuka HMeeting abstracts of the Physical Society of Japan 2011/08
- Watanabe Y, Saito H, Hiura K, Shimizu Y, Yanagisawa T, Hidaka H, Yokoyama M, Amitsuka HMeeting abstracts of the Physical Society of Japan 2011/08
- SmOs4Sb12の音響ドハース・ファンアルフェン効果 [Not invited]柳澤達也, 門別翔太, 日高宏之, 網塚浩, 赤津光洋, 荒木幸治, 根本祐一, 後藤輝孝, HO Pei‐Chun, BAUMBACH Ryan E, MAPLE M. Brian日本物理学会講演概要集 2011/08
- 重い電子系超伝導体UBe13における異常な磁気特性 [Not invited]清水悠晴, 池田陽一, 芳賀芳範, 日高宏之, 柳澤達也, 網塚浩日本物理学会講演概要集 2011/08
- UPd2Si2の非整合‐整合磁気秩序相における圧力下磁化測定 [Not invited]五十嵐英紀, 日高宏之, 清水悠晴, 田端千紘, 柳澤達也, 網塚浩日本物理学会講演概要集 2011/08
- 強相関5f電子系化合物における量子異常の研究と新規物性の探索 [Not invited]網塚浩, 本間佳哉, 李徳新, 柳澤達也, 日高宏之, 清水悠晴, 倉橋洋祐, 高橋宗佑, 齋藤旬, 田端千紘東北大学金属材料研究所附属量子エネルギー材料科学国際研究センター共同利用研究経過報告書(CD-ROM) 2011/06
- Shimizu Y, Ikeda Y, Tenya K, Haga Y, Hidaka H, Yanagisawa T, Amitsuka HMeeting abstracts of the Physical Society of Japan 2011/03
- 重い電子系超伝導体UBe13におけるMakiパラメーター II [Not invited]清水悠晴, 池田陽一, 天谷健一, 芳賀芳範, 日高宏之, 柳澤達也, 網塚浩日本物理学会講演概要集 2011/03
- Elastic Constants of Filled Skutterudite LaRu4As12 [Not invited]MAPLE Mb, HENKIE Z, CICHOREK T, AMITSUKA H, HIDAKA H, SAITOH H, YANAGISAWA TINTERNATIONAL CONFERENCE ON STRONGLY CORRELATED ELECTRON SYSTEMS (SCES 2010) 2011
- Yanagisawa T, Saito H, Hidaka H, Amitsuka H, Akatsu M, Araki K, Takahashi N, Nemoto Y, Goto T, Ho Pei-Chun, Baumbach Ryan E, Maple M. BrianMeeting abstracts of the Physical Society of Japan 2010/08
- Kurahashi Y, Nishikawa D, Shimizu Y, Hidaka H, Yanagisawa T, Yokoyama M, Amitsuka HMeeting abstracts of the Physical Society of Japan 2010/08
- Saito H, Yanagisawa T, Mayama T, Ikeda Y, Hidaka H, Yokoyama M, Amitsuka HMeeting abstracts of the Physical Society of Japan 2010/08
- Shimizu T, Ikeda Y, Tenya K, Haga Y, Hidaka H, Yanagisawa T, Amitsuka HMeeting abstracts of the Physical Society of Japan 2010/08
- 26aWJ-1 Effects of Pressure on Incommensurate-Commensurate Magnetic Phase Transitions in UPd_2Si_2 [Not invited]Hidaka H, Igarashi H, Tanaka A, Takahashi S, Yanagisawa T, Amitsuka HMeeting abstracts of the Physical Society of Japan 2010/08
- Takahashi S, Hidaka H, Shimizu Y, Kurahashi Y, Yanagisawa T, Amitsuka HMeeting abstracts of the Physical Society of Japan 2010/08
- U系強磁性化合物U4Ru7Ge6の基礎物性 [Not invited]高橋宗佑, 日高宏之, 清水悠晴, 倉橋洋祐, 柳澤達也, 網塚浩日本物理学会講演概要集 2010/08
- UPd2Si2における非整合―整合磁気秩序の圧力効果 [Not invited]日高宏之, 五十嵐英紀, 田中淳, 高橋宗佑, 柳澤達也, 網塚浩日本物理学会講演概要集 2010/08
- 充填スクッテルダイトSmOs4Sb12の超音波分散 [Not invited]柳澤達也, 齋藤旬, 日高宏之, 網塚浩, 赤津光洋, 荒木幸治, 高橋直紀, 根本祐一, 後藤輝孝, HO Pei‐Chun, BAUMBACH Ryan E, MAPLE M. Brian日本物理学会講演概要集 2010/08
- 重い電子系化合物U(Ru1-xRhx)2Si2の弾性応答 [Not invited]齋藤旬, 柳澤達也, 真山太一, 池田陽一, 日高宏之, 横山淳, 網塚浩日本物理学会講演概要集 2010/08
- URu2Si2における角度分解磁化測定 [Not invited]倉橋洋祐, 西川大地, 清水悠晴, 日高宏之, 柳澤達也, 横山淳, 網塚浩日本物理学会講演概要集 2010/08
- 重い電子系超伝導体UBe13におけるGinzburg‐Landauパラメーター [Not invited]清水悠晴, 池田陽一, 天谷健一, 芳賀芳範, 日高宏之, 柳澤達也, 網塚浩日本物理学会講演概要集 2010/08
- Saito H, Yanagisawa T, Mayama T, Ikeda Y, Hidaka H, Yokoyama M, Amitsuka HMeeting abstracts of the Physical Society of Japan 2010/03
- 21aPS-23 Pressure-induced bicritical point in UPd_2Si_2 [Not invited]Hidaka H, Igarashi H, Tanaka A, Yanagisawa T, Amitsuka HMeeting abstracts of the Physical Society of Japan 2010/03
- 21aPS-31 Ultrasonic Measurement of LaRu_4Sb_<12> [Not invited]Yanagisawa T, Hidaka H, Amitsuka H, Cichorek T, Henkie Z, Maple M. BMeeting abstracts of the Physical Society of Japan 2010/03
- Shimizu Y, Ikeda Y, Wakabayashi T, Tenya K, Haga Y, Hidaka H, Yanagisawa T, Amitsuka HMeeting abstracts of the Physical Society of Japan 2010/03
- URu2Si2の高圧下磁化測定 II [Not invited]西川大地, 池田陽一, 清水悠晴, 日高宏之, 柳澤達也, 横山淳, 網塚浩日本物理学会講演概要集 2010/03
- 重い電子系超伝導体UBe13における基礎物性測定 [Not invited]清水悠晴, 池田陽一, 若林琢巳, 天谷健一, 芳賀芳範, 日高宏之, 柳澤達也, 網塚浩日本物理学会講演概要集 2010/03
- 重い電子系化合物URu2Si2のRhドープ系における超音波測定 [Not invited]齋藤旬, 柳澤達也, 真山太一, 池田陽一, 日高宏之, 横山淳, 網塚浩日本物理学会講演概要集 2010/03
- UPd2Si2における圧力誘起多重臨界点 [Not invited]日高宏之, 五十嵐英紀, 田中淳, 柳澤達也, 網塚浩日本物理学会講演概要集 2010/03
- 充填スクッテルダイトLaRu4As12の超音波測定 [Not invited]柳澤達也, 日高宏之, 網塚浩, CICHOREK T, HENKIE Z, MAPLE M日本物理学会講演概要集 2010/03
- UPd2Si2の圧力効果 [Not invited]田中淳, 高橋宗佑, 日高宏之, 柳澤達也, 網塚浩日本物理学会講演概要集 2009/08
- NiCrAl製ピストンシリンダーの開発とURu2Si2の高圧下磁化測定 [Not invited]西川大地, 池田陽一, 日高宏之, 柳澤達也, 横山淳, 網塚浩日本物理学会講演概要集 2009/08
- 立方晶希土類化合物R3Pd20Ge6(R=Ce,Pr)におけるLa希釈効果 [Not invited]若林琢巳, 日高宏之, 柳澤達也, 横山淳, 天谷健一, 網塚浩日本物理学会講演概要集 2009/08
- Ultrasonic study of the filled skutterudite compound NdOs4Sb12 [Invited]T. YanagisawaSCES’07 (The international Conference on Strongly Correlated Electron Systems) アメリカ合衆国 ヒューストン 2007
- 充填スクッテルダイト PrOs4As12 の弾性定数 [Not invited]日本物理学会 (25aYA-5 口頭発表) 千葉大学 2006
- Quadrupole Susceptibility of NdOs4Sb12 [Not invited]ICM’06 (International Conference of Magnetism) 京都国際会議場 2006
- Ultrasonic dispersion due to the rattling motion in the filled skutterudite La(Os0.5Ru0.5)4Sb12 [Not invited]APS March Meeting ロサンジェルス・コンヴェンションセンター 2005
- Magnetic Anisotropy of Antiferro-quadrupole Ordering in Tetragonal HoB2C2 [Not invited]SCES’04 (The international Conference on Strongly Correlated Electron Systems) ドイツ連邦共和国 カールスルーエ大学 2004
- Ultrasonic study of antiferro-quadrupole ordering in HoB2C2 [Not invited]LT23 (The International Conference on Low Temperature Physics) 広島国際会議場 2002
- Ultrasonic investigation of metamagnetic transition in CeRu2Si2 [Not invited]ORBITAL2001 (The international Conference on Strongly Correlated Electrons with Orbital Degrees of Freedom) 仙台国際センター 2001
- J-Physics 2018: サマースクール & 新物質と結晶育成に関する国際ワークショップ [Not invited]Awaji Yumebutai International Conference Center
- Probing the ‘Hidden Order’ Phase in URu2Si2 by Means of Ultrasonic Measurements in Pulsed Magnetic Fields [Not invited]Tatsuya YanagisawaINTERNATIONAL CONFERENCE ON MAGNETISM (ICM2018) MOSCONE CENTER San Francisco
Teaching Experience
- Exercises in Electromagnetism 1Exercises in Electromagnetism 1 Dept. of Physics, Hokkaido Univ.
- Electromagnetism 1Electromagnetism 1 Dept of Physics, Hokkaido Univ.
- Review of Modern PhysicsReview of Modern Physics Hokkaido University
- Physics 2Physics 2 Hokkaido University
- Physics 1Physics 1 Hokkaido University
- Physics 2Physics 2 Hokkaido University
Association Memberships
Research Projects
- Japan Society for the Promotion of Science：Grants-in-Aid for Scientific ResearchDate (from‐to) : 2023/04 -2028/03Author : 柳澤 達也
- Japan Society for the Promotion of Science：Grants-in-Aid for Scientific ResearchDate (from‐to) : 2023/04 -2028/03Author : 鬼丸 孝博, 大槻 純也, 田端 千紘, 柳澤 達也, 大原 繁男, 吉田 紘行, 網塚 浩, 井澤 公一, 小林 達生, 小林 夏野, 木俣 基
- Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)Date (from‐to) : 2022/04 -2025/03Author : 柳澤 達也
- Japan Society for the Promotion of Science：Grants-in-Aid for Scientific ResearchDate (from‐to) : 2021/10 -2025/03Author : 柳澤 達也
- Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)Date (from‐to) : 2019/04 -2023/03Author : 井原 慶彦, 柳澤 達也, 松井 一樹, 吉田 紘行, 福岡 脩平, 小濱 芳允研究初年度となる2019年度は、本研究計画の主要装置となる小型パルス磁場発生装置の電源のエネルギーをを既存の10kJから30kJへと拡充し、更新した電源を用いてこれまでのところ20テスラ超までの磁場発生に成功した。これは、小規模の研究室における発生磁場としては最強レベルであり、ここまでの強磁場をコンパクトな磁場発生装置で勘弁に発生できることを実証できたことはすでに非常に意義がある。また、マグネットの強度を改善することで予定していた30テスラを超える磁場発生が可能であることが分かった。実際のマグネット改造は2年度への課題とした。 測定系では、まず超音波測定装置を立ち上げ、重い電子系物質において2 K以下までの超音波測定を可能にした。今回立ち上げた装置を用いて、量子振動の観測に成功し、実際の物性研究を行うに十分な測定精度を持つことが確認できた。特に、今回は高速オシロスコープを取り入れたデジタル分光方式を採用し、新しい測定原理に基づく超音波測定を実施できるようになったことは意義が深い。この方式は、パルス磁場中測定だけでなく、定常磁場中にも応用でき、測定難易度を下げることが期待される。 次に、核磁気共鳴分光装置に関しては、周波数の高速変調技術を確立し、5ミリ秒という短いパルス磁場発生時間中に非常に広帯域の周波数スペクトルの観測に成功した。この技術を用いて、20テスラまでのスペクトル測定はもとより、東京大学物性研究所における共同利用実験では53テスラまでのNMRスペクトル測定に成功し、その実用性が実証済みである。 最後に、3つ目のプローブとなる熱測定は、東京大学物性研究所においてすでに稼働しているパルス磁場中熱測定システムを用いた実験を行い、測定技術の移植を行っている。2019年度は測定に必要な装置群およびプローブの準備を行い、2020年度の立ち上げに備えた。
- MEXT：Grant-in-Aid for Scientific Research (B)Date (from‐to) : 2019/04 -2023/03Author : IHARA Yoshihiko19H01832 本研究計画では、非常に高い磁場領域で実現する新奇物性を先端的な精密測定を用いて観測し、その起源を解明していく。一般的な超伝導磁石を用いた強磁場発生法では、15テスラ程度の磁場が限界であるが、瞬間的に強磁場を発生させるパルス磁場技術ではこれをはるかに超える30テスラ超級の磁場を発生させることができる。しかし、数十ミリ秒のあいだに数十テスラの磁場変動が起こるため、パルス磁場下での精密測定は困難であった。そこで、最新の磁場制御技術により数ミリ秒の間磁場の時間変動が全く無くなる準定常磁場を利用することで、複数の精密測定を実現し、これらを多角的に用いた研究により強磁場物性を開拓する。
- Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)Date (from‐to) : 2018/04 -2020/03Author : 柳澤 達也公募研究D01班の鬼丸らとの共同研究としてPrを非磁性のYによって希釈したY1-xPrxIr2Zn2単結晶試料（x = 0.0, 0.034, 0.37）の系統的な超音波実験を行った。その結果、x=0.034の希釈極限試料では四極子近藤効果を実証する上での決め手となる弾性定数(C11-C12)/2の対数的温度変化の観測に成功した。一方、x = 0.37の中間濃度試料の極低温領域では対数的よりはむしろT^(1/2)に比例する温度依存性を示すことがわかった。また新たに超音波分散を発見した。 公募研究B01班の平井らとの共同研究として、パイロクロア酸化物Cd2Re2O7の逐次構造相転移にたいして予言されている電気トロイダル四極子秩序の実験的証拠を得るために、横波弾性 定数(C11-C12)/2とC44を横波超音波で測定し、秩序変数の対称性の検証を試みた。その結果、中間相において、巨大な周波数変化を伴う超音波吸収の増大と弾性定数のソフト化を観測した。 上記の成果は強相関電子系の多極子自由度を観測する本研究の目的と合致し、本新学術領域内での新たな共同研究が芽生えたことで、超音波測定技術を活かした今後のさらなる研究発展が期待できる。よって、当初の計画以上に進展したと言える。東北大金属材料研究所の25T-SCMに同軸管内蔵の２軸ゴニオメータを組み合わせ、URu2Si2のc面内磁気異方性を弾性定数で検証する実験の準備を終えた。しかし、本年度マグネットの不具合が発生し共同利用実験は延期となった。 研究当初から開発を続けている高温測定装置は耐熱同軸管の高温領域でのテストが完了し、冷却水系の安全スイッチ、防爆用のキャビネットなどを新たに設置し単結晶Siを用いた予備測定に漕ぎ着けた。しかし研究期間内にBaMn2As2の高温領域における弾性応答の測定は達成できなかったため、今後も研究を継続する予定。
- Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)Date (from‐to) : 2017/04 -2020/03Author : Yanagisawa TatsuyaThe elastic response of a uranium compound (UNi4B) exhibiting vortex-like magnetic ordering (magnetic toroidal dipolar ordering), which breaks the spatial inversion symmetry, has been precisely measured by using the ultrasonic phase-comparison method down to very low temperatures and high magnetic fields. We have succeeded in identifying the electric quadrupoles that maintain their degrees of freedom without ordering at the center of a magnetic vortex arrangement in uranium with a honeycomb structure. The response of the quadrupoles depends strongly on the direction of the magnetic field. We discover a new phase V appears at high magnetic fields and low temperatures for H || b. We can conclude that the electric quadrupoles play an important role in the vortex-like magnetic structure of this system, modifying the spin-reorientation process as well.
- MEXT：Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)Date (from‐to) : 2018/04 -2020/03Author : YANAGISAWA Tatsuya18H04297
- MEXT：Grant-in-Aid for Scientific Research (C)Date (from‐to) : 2017/04 -2020/03Author : YANAGISAWA Tatsuya17K05525
- MEXT：Fund for the Promotion of Joint International Research (Fostering Joint International Research)Date (from‐to) : 2016/03 -2019/03Author : YANAGISAWA Tatsuya15KK0146
- Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Exploratory ResearchDate (from‐to) : 2015/04 -2018/03Author : AMITSUKA Hiroshi, AMITSUKA Hiroshi, HDAK Hiroyuki, SAITO Hiraku, SHIKANAI Nana, YAMAMOTO Masataka, NAKAO Hironori, TABATA Chihiro, TANIDA Hiroshi, SERA Masafumi, MATSUMURA Takeshi, SECHOVSKÝ Vladimir, UHLíŘOVÁ Klára, VALIŠKA Michal, ZHERLITSYN Sergei, WOSNITZA Jochen, SÜLLOW StefanThis project aimed at testing experimentally for a new electromagnetic effect that was theoretically predicted in a magnetic metal showing order of “toroidal moment”, which corresponds to a vertex-like configuration of electron spins. We performed magnetization measurements under electric currents on a layered uranium compound, UNi4B, which was expected to be a realistic candidate for the theoretical prediction, and observed that uniform magnetization is induced in proportion to the strength of applied electric currents. The obtained experimental results have shown the essential validity of the theoretical prediction. However, we also found that there is an inconsistency between the theory and the experimental results regarding the current-direction dependence of magnetization, raising a new issue of reinvestigation of crystal and magnetic structure of this system. In addition to these, we found two new antiferromagnetic materials that show the similar electromagnetic effect.
- MEXT：Grant-in-Aid for Challenging Exploratory ResearchDate (from‐to) : 2015/04 -2018/03Author : AMITSUKA HiroshiThis project aimed at testing experimentally for a new electromagnetic effect that was theoretically predicted in a magnetic metal showing order of “toroidal moment”, which corresponds to a vertex-like configuration of electron spins. We performed magnetization measurements under electric currents on a layered uranium compound, UNi4B, which was expected to be a realistic candidate for the theoretical prediction, and observed that uniform magnetization is induced in proportion to the strength of applied electric currents. The obtained experimental results have shown the essential validity of the theoretical prediction. However, we also found that there is an inconsistency between the theory and the experimental results regarding the current-direction dependence of magnetization, raising a new issue of reinvestigation of crystal and magnetic structure of this system. In addition to these, we found two new antiferromagnetic materials that show the similar electromagnetic effect.
- Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research Fund for the Promotion of Joint International Research (Fostering Joint International Research)Date (from‐to) : 2016 -2018Author : Yanagisawa Tatsuya, Maple M. Brian, Zherlitsyn Sergei, Sechovský Vladimír, Amitsuka Hiroshi, Green Elizabeth Lauren, Nakamura Shintaro, Awaji SatoruCubic cage-structured compound PrNi2Cd20 show no evidence for magnetic order in specific heat ang magnetization and suggest a non-Kramers Γ3-doublet crystalline electric field ground state. In order to investigate the CEF ground state and search for possible exotic phenomena such as quadrupolar order and multi-channel Kondo effect, we have performed ultrasonic measurements on a single crystal of PrNi2Cd20 and its reference materials (SmNi2Cd20, (Y,Pr)Ir2Zn20, RBe13 (R = Lu, Th, U), and UAu2Si2), down to 0.02 K up to 58 T, in collaboration with UC San Diego (USA), Dresden High-Magnetic Field Lab. (Germany), Charles Univ. (Prague), IMR, Tohoku Univ. (Japan) and Hokkaido Univ. (Japan). We found corroborating evidence for quadrupolar Kondo effect, and possible multipolar contributions on the low-temperature magnetic field-induced phase of these compounds.
- Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)Date (from‐to) : 2014/04 -2017/03Author : Yanagisawa Tatsuya, AMITSUKA Hiroshi, HIDAKA Hiroyuki, Maple M. Brian, Zherlitsyn S.Crystalline electric field (CEF) ground state of SmOs_4Sb_12, which shows magnetic field robust heavy fermion state, is determined as Gamma_67 by ultrasonic measurements under pulsed-magnetic field. Further, the results of ultrasonic measurements under hydrostatic pressure on this compound strongly suggests that a magnetic octupolar interaction plays an important role in the low-temperature magnetic ordered phase in SmOs_4Sb_12. On the other hand, the elastic constant (C_11-C_12)/2 of a new cage-structural compound PrNi_2Cd_20, which was grown at Maple group in University of California San Diego, is observed down to 30 mK. It is clarified that this system has Gamma_3 non-Kramers doublet CEF ground state.
- MEXT：Grant-in-Aid for Scientific Research (C)Date (from‐to) : 2014/04 -2017/03Author : Tatsuya YanagisawaCrystalline electric field (CEF) ground state of SmOs_4Sb_12, which shows magnetic field robust heavy fermion state, is determined as Gamma_67 by ultrasonic measurements under pulsed-magnetic field. Further, the results of ultrasonic measurements under hydrostatic pressure on this compound strongly suggests that a magnetic octupolar interaction plays an important role in the low-temperature magnetic ordered phase in SmOs_4Sb_12. On the other hand, the elastic constant (C_11-C_12)/2 of a new cage-structural compound PrNi_2Cd_20, which was grown at Maple group in University of California San Diego, is observed down to 30 mK. It is clarified that this system has Gamma_3 non-Kramers doublet CEF ground state.
- 日本学術振興会：科学研究費助成事業 新学術領域研究(研究領域提案型)Date (from‐to) : 2011/04 -2013/03Author : 柳澤 達也1. 重い電子超伝導物質PrOs_4Sb_12の電気抵抗と弾性定数の同時測定を磁場中で行い，弾性応答の観点から超伝導相図の再構築を試みた．その結果，本系の非BCS超伝導は測定感度内で弾性定数C_11(= C_B+4/3*(C_11-C_12)/2)に変化をもたらさないことがわかった．一方，過去の報告（~17 MHz)では結晶場以外の寄与による弾性定数(C_11-C_12)/2のソフト化がT_c近傍まで続き，T_c以下でソフト化が停止するとされており，本研究結果と大きく矛盾する．ここで，本研究では320 MHzまでの高周波測定を行い，複数の周波数帯において再現性を確認していることを鑑みると，過去の測定では，超音波の低い指向性によって異なる超音波モードの混在が起こっている可能性が高いという結論に至った． 2. Uを内包するカゴ状結晶構造を持つクラスレート化合物U_3Pd_20Si_6の磁場中超音波測定を行った。試料表面を研磨し，測定精度のさらなる向上を試みた結果，T_N直下において超音波の吸収・散乱が生じ測定が困難になる領域が磁場の印可に伴い拡大することを発見した．その領域は過去の報告にある低温・高磁場領域のスピンフロップ相に繋がることが予想され，大きな弾性異常とスピンフロップ状態の複雑な磁気構造からは高次多極子の寄与が示唆される．尚, 本系8cサイトのUのサイトシンメトリーはTdでありパリティ混成に起因する奇パリティの電気・磁気多極子が関与している可能性も考えられる． 3. ラットリングを示すカゴ状化合物探索の一環として，神戸大菅原氏から提供されたEuOs4Sb12の超音波測定を行なった．本系は零磁場で9 K付近に強磁性転移を示すが，磁場中での弾性定数測定の結果，8 T, 10 K近傍でキュリー点が消失した後に，超音波分散らしき周波数依存性を伴う弾性異常を発見した．
- Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B)Date (from‐to) : 2011 -2012Author : YANAGISAWA TatsuyaWe have performed ultrasonic measurements of elastic constant (C11-C12)/2 on URu2Si2 by using long-pulsed magnetic field up to 68.7 T at Dresden High Magnetic-field Laboratory in order to investigate the multipole ordering models which has recently been proposed to explain the unknown 'hidden order' parameter of this compound. The present results show that the c-f hybridized heavy-electron state of this compound accompanies 3-lattice instability, and also suggest that the both hybridization and the lattice instability disappears at high magnetic field region.
- MEXT：Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)Date (from‐to) : 2011 -2012Author : 柳澤 達也23102701 (1)、磁場に鈍感な重い電子状態を示し,同時に磁場に依存しない局所フォノン自由度を持つ充填スクッテルダイト化合物SmOs4Sb12の強磁場下における超音波測定を行うことで,結晶場基底状態を明らかにすることを目的とし,平成23年11月にドイツ,ドレスデン強磁場研究所で62Tパルス磁場下超音波実験を行った.その結果,4.2Kに於ける弾性定数C11の磁場依存性は10T付近で極小をとり,高磁場領域ではdHvA振動を繰り返しながら励磁と共にゆるやかに上昇する傾向を示した.立方晶系においてC11はΓ1対称性のOBとΓ3対称性の四極子感受率の和として記述されるため,高磁場領域でOBの影響が小さいと仮定した場合,本実験結果はΓ8四重項基底状態を示唆する結果である. (2)、ラットリングを示すカゴ状化合物探索の一環として,EuOs4Sb12の単結晶試料育成を試行したものの,超音波実験に使用できる1立方ミリメートル程度の単結晶サイズを得る事ができず,現在も試行を繰り返している.一方,カゴ状結晶構造を持つ重い電子超伝導体として古くから知られるUBe13とその類似物質群RBe13(R=ランタノイド)の単結晶育成に成功し,1立方ミリメートル程度の単結晶を得た.試料評価と研磨を行い,超音波実験の準備をほぼ完了した. (3)、キャパシタンス法による熱膨張セルをCADで設計し,民間の金属加工業者(0.1mピッチネジ部品)と...
- MEXT：Grant-in-Aid for Young Scientists (B)Date (from‐to) : 2011 -2012Author : YANAGISAWA Tatsuya23740250 １、重い電子系URu2Si2の隠れた秩序相の問題に対し，Rh希釈系のU(Ru1-xRhx)2Si2 (x = 0，0.02，0.07)単結晶試料を用いて高分解能超音波測定 (測定周波数f ≦ 175MHz)を行い，弾性応答の観点から反強四極子秩序の検証を行なった．Rhドープによって誘起される反強磁性秩序相での弾性応答を初めて観測した．反強磁性相での横波弾性定数C44，C66，(C11-C12)/2の変化量が，縦波弾性定数C11に比べてそれぞれ１/60, 1/500, 1/20程度であることから，これらのモードに対応する歪みは生じておらず，10E-5の精度内でRhドープ系における反強磁性転移前後で格子の対称性が保たれていることを確認した．一方，母物質に現れる弾性定数(C11-C12)/2のソフト化が隠れた秩序が消失するx = 0.07においても現れ、極低温で一定値に収束する振る舞いを得た．２、参照物質ThRu2Si2の弾性定数を測定し、それをURu2Si2の弾性定数と比較し，擬似的に格子・フォノンの寄与を差し引く事により、5f電子の弾性定数への寄与を浮き彫りにした．その結果、URu2Si2ではΓ3対称性の歪み場に対応する弾性定数(C11-C12)/2だけに5f電子の寄与に依るソフト化が生じていることが解った。３、平成23年楠瀬らによって提案された、隠れた秩序変数の有力な候補であ...
- 日本学術振興会：科学研究費助成事業 新学術領域研究(研究領域提案型)Date (from‐to) : 2009 -2010Author : 柳澤 達也充填スクッテルダイト化合物SmOs_4Sb_<12>はその電子比熱係数(γ=820mJ mol^<-1>K^<-2>)が30Tの高磁場下比熱測定に於いても磁場に依存せず増強されたままであることから,「磁場に鈍感な重い電子系」として注目されている.この電子比熱係数の磁場に対する堅牢性は従来型のスピン自由度に由来する磁気近藤効果の理論では説明できないため,4f電子の持つ電気多極子自由度に由来する多チャンネル近藤効果や,ゲストイオンの局所振動(局所電荷分布の自由度)と電子系の結合による新規多体効果などの新たな理論提案が活発に為されている. 本研究ではそのようなエキゾチックな多体効果の由来となる局所電荷自由度を実験的に観測できる超音波をプローブとして用い,新たにフラックス法で育成したSmOs_4Sb_<12>の単結晶に対して超音波精密測定を行った.その結果,横波弾性定数C_<44>は結晶場効果によるソフト化を示し,多体効果により低温で収束する振る舞いを示した.一方、縦波弾性定数C_<11>においてはエネルギーと時間スケールの異なる2つの超音波分散の観測に成功した.また新潟大学後藤研究室との共同研究でヘリウム3冷凍機を用いた磁場中極低温実験を行い,10Tの磁場下においてもその超音波分散が全く磁場の影響を受けないことを明らかにし,磁場に鈍感な重い電子系であるSmOs_4Sb_<12>のゲストSmイオンが,磁場依存しない局所非調和振動の自由度を有することを実験的に初めて証明した.超音波分散の現象論的解析からラットリングの活性エネルギーと特性時間を見積もり,それらとアインシュタイン温度,電子比熱係数γ等の系統変化に相関があることを指摘した.
- MEXT：Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)Date (from‐to) : 2009 -2010Author : YANAGISAWA Tatsuya21102501 充填スクッテルダイト化合物SmOs_4Sb_<12>はその電子比熱係数(γ=820mJ mol^<-1>K^<-2>)が30Tの高磁場下比熱測定に於いても磁場に依存せず増強されたままであることから,「磁場に鈍感な重い電子系」として注目されている.この電子比熱係数の磁場に対する堅牢性は従来型のスピン自由度に由来する磁気近藤効果の理論では説明できないため,4f電子の持つ電気多極子自由度に由来する多チャンネル近藤効果や,ゲストイオンの局所振動(局所電荷分布の自由度)と電子系の結合による新規多体効果などの新たな理論提案が活発に為されている.本研究ではそのようなエキゾチックな多体効果の由来となる局所電荷自由度を実験的に観測できる超音波をプローブとして用い,新たにフラックス法で育成したSmOs_4Sb_<12>の単結晶に対して超音波精密測定を行った.その結果,横波弾性定数C_<44>は結晶場効果によるソフト化を示し,多体効果により低温で収束する振る舞いを示した.一方、縦波弾性定数C_<11>においてはエネルギーと時間スケールの異なる2つの超音波分散の観測に成功した.また新潟大学後藤研究室との共同研究でヘリウム3冷凍機を用いた磁場中極低温実験を行い,10Tの磁場下においてもその超音波分散が全く磁場の影響を受けないことを明らかにし,磁場に鈍感な重い電子系であるSmOs_4Sb_<12>のゲス...
- Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research Grant-in-Aid for Specially Promoted ResearchDate (from‐to) : 2006 -2010Author : GOTO Terutaka, NEMOTO Yuichi, KITAZAWA Hideaki, SUZUKI Hiroyuki, KANETA Hiroshi, YANAGISAWA Tatsuya, IYETOMI Hiroshi, ONO Yoshiaki, TAKEDA Naoya, TSURUTA Kenji, SAKAI Osamu, AKATSU Mitsuhiro, ISHII Isamu, MITSUMOTO KeisukeThe ultrasonic strains have specified symmetries and couple to the electric quadrupoles of the electronic and ionic quantum states. The ultrasonic measurements of the elastic constants and attenuation coefficients, therefore, may determine the quadrupole susceptibility. In the present projects, using low-temperature ultrasonic phase difference measurement apparatus with a highly velocity resolution, we have carried out a study of non-Kramers doublet of localized 4f-electron in rare-earth compounds, rattling of local oscillator in clathrate compounds, vacancy orbital in boron-doped silicon crystal in pursuing strongly correlated quantum phases associated with charge fluctuation.
- Ministry of Education, Culture, Sports, Science and Technology：Grants-in-Aid for Scientific Research(若手研究(B))Date (from‐to) : 2008 -2009Author : Tatsuya YANAGISAWA, Terutaka GOTO, Naoya TAKEDA, Yuichi NEMOTO, M. Brian Maple, Ryan E. Baumbach, Pei-Chun HoUltrasonic measurements on the Filled-Skutterudite compounds Pr_<1-x>NdxOs_4Sb_<12>(x=0.45, 0.25, 1.0)have been performed. Frequency dependences of elastic constant C11 were investigated with longitudinal ultrasonic frequencies varying between 34 to 245 MHz on these samples. A characteristic ultrasonic dispersion, which had also been observed in PrOs_4Sb_<12> (x=0) at around 30K, is also observed in the dilute systems and shifts gradually to higher temperature with increasing the Nd concentration x. On the other hand, the C11 of x=0.45 sample shows softening and levels off feature at T=0.25...
- Ministry of Education, Culture, Sports, Science and Technology：Grants-in-Aid for Scientific Research(基盤研究(B))Date (from‐to) : 2007 -2009Author : Hiroshi AMITSUKA, Kenichi TENYA, 横山 淳, Hiroyuki HIDAKA, Tatsuya YANAGISAWAWe have obtained, for the first time, microscopic evidence that weak antiferromagnetism of the 5f-electron superconductor URu_2Si_2 is ascribed to an inhomogeneous antiferromagetic order induced by a residual stress in a crystal. We have further shown that the superconductivity of this system does not coexist with the antiferromagnetism but does occur only in the unknown ordered state called "hidden order". Some new findings have also been obtained from the study of related materials, regarding electronic properties in the vicinity of quantum phase transitions and magnetism of 5f-electron s...
- 多極子自由度・オフセンタ自由度を有する希土類化合物の磁性と超伝導の研究科学技術振興調整費による総合研究Date (from‐to) : 2007
- Novel magnetism and superconductivity on rare-earth compounds which possess multipolar and/or off-center degrees of freedomSCF Comprehensive Joint Research (General Research)Date (from‐to) : 2007
- 日本学術振興会：科学研究費助成事業 特別研究員奨励費Date (from‐to) : 2003 -2004Author : 柳澤 達也1 HoB_2C_2のIV相に関して行った熱膨張実験と、物質・材料研究機構のハイブリッドマグネットを用いて行った超音波実験によって得られた弾性定数・H-T相図を考察した結果、以下の結論が得られた。 (1)対称性の低下により、立方晶においてΓ_4対称性とΓ_5対称性に区分されていた八極子が、正方晶系においては混合して現れる。IV相の秩序変数は
・= = ≠0と結論した。 (2)H-T相図の強い磁気異方性より、HoB_2C_2の八極子相互作用にも異方性があることがわかった。その結果、八極子秩序 = = ≠0によって誘起される強四極子モーメントにも異方性が現れる。これは熱膨張測定によって得られた結果ε_ <ε_ =ε_ =1.2×10^<-4>とも一致する。 2 充填スクッテルダイトPrOs_4Sb_<12>の超音波実験に共同研究として参加した。PrOs_4Sb_<12>のでは、カゴ状化合物La_3Pd_<20>Ge_6とCe_3Pd_<20>Ge_6で発見された希土類イオンのラットリング振動に類似した弾性定数の分散を観測した。また、磁場中でのPrOs_4Sb_<12>の弾性定数を四極子感受率によって解析し、結晶場基底状態をΓ_1対称性と結論づけた。 3 申請者は平成16年4月から渡米し、カリフォルニア大サンディエゴ校のMaple研究室で充填スクッテルダイトの研究を行った。超音波実験を行うために、LaOs_4Sb_<12>,LaRu_4Sb_<12>,La(Os_<0.5>Ru_<0.5>)_4Sb_<12>の単結晶作成を試み、La(Os_<0.5>Ru_<0.5>)_4Sb_<12>の単結晶を得ることに成功した。日本に試料を持ち帰り、新潟大学後藤研究室で^3He冷凍機を用いた超音波測定を行い、PrOs_4Sb_<12>で観測されたラットリングに起因する超音波分散と同様の弾性異常を観測した。
Media Coverage
- Date : 2021/05/21Writer: Other than myselfPublisher, broadcasting station: 科学新聞Program, newspaper magazine: 科学新聞第四面 Paper
- Date : 2021/04/15Writer: Other than myselfPublisher, broadcasting station: Optronics OnlineInternet
- Date : 2020/12/20Writer: Other than myselfPublisher, broadcasting station: 放送大学Program, newspaper magazine: “科学”からの招待状 電気と磁気の不思議な相関：鏡の国のサッカーゲームMedia report 「鏡の国のアリス」では、鏡の向こうの世界では砂糖が苦くなる。物質内部の世界も鏡に映すと(正確には反転させると）元の世界とは異質の現象が起きる事実が次々と発見されている。このような「反転対称性の破れた物質における電気と磁気の不思議な相関」を主題とした新学術領域の最新学術成果を踏まえ、一見身近な電気と磁気の関係には広大な未踏領域が潜んでいることを伝える。