Researcher basic information

• 博士（理学）, 北海道大学

• https://researchmap.jp/hiroshi_amitsuka?lang=en

• https://jglobal.jst.go.jp/detail?JGLOBAL_ID=200901000868078276
• http://phys.sci.hokudai.ac.jp/LABS/kyokutei/vlt/

• 200901000868078276

• 極低温物性実験

• Natural Science, Magnetism, superconductivity and strongly correlated systems

• Bachelor's degree program, School of Science
• Master's degree program, Graduate School of Science
• Doctoral (PhD) degree program, Graduate School of Science

Research activity information

• Successive Phase Transitions in the Quasi-Kagome Lattice System URhSn Studied by Resonant X-ray Scattering
  Chihiro Tabata; Fusako Kon; Ruo Hibino; Yusei Shimizu; Hiroshi Amitsuka; Koji Kaneko; Yoshiya Homma; Dai Aoki; Hironori Nakao
  JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 94, 8, 15 Aug. 2025, [Peer-reviewed]
  English, Scientific journal
• Elastic Softening in Synthetic Diamonds
  Tatsuya Yanagisawa; Ruo Hibino; Hiroyuki Hidaka; Hiroshi Amitsuka; Toshiyuki Tashima; Mitsuhiro Akatsu; Yuichi Nemoto; Sergei Zherlitsyn; Joachim Wosnitza
  JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 94, 7, 15 Jul. 2025, [Peer-reviewed]
  English, Scientific journal
• Anisotropic Magnetic Field-Temperature Phase Diagrams in CeCoSi
  Hiroyuki Hidaka; Shun Yanagiya; Shintaro Onodera; Tatsuya Yanagisawa; Hiroshi Amitsuka; Hiroshi Tanida; Takayuki Ishitobi
  JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 94, 3, 15 Mar. 2025, [Peer-reviewed]
  English, Scientific journal
• Polarized Neutron Diffraction Study on UPt₂Si₂
  Fusako Kon; Chihiro Tabata; Hiraku Saito; Taro Nakajima; Hiroyuki Hidaka; Tatsuya Yanagisawa; Hiroshi Amitsuka
  Journal of the Physical Society of Japan, 93, 4, Physical Society of Japan, 15 Apr. 2024, [Peer-reviewed], [Last author]
  Scientific journal
• Magnetic order in honeycomb layered U2Pt6Ga15 studied by resonant x-ray and neutron scattering
  Chihiro Tabata; Fusako Kon; Kyugo Ota; Ruo Hibino; Yuji Matsumoto; Hiroshi Amitsuka; Hironori Nakao; Yoshinori Haga; Koji Kaneko
  Physical Review B, 01 Apr. 2024, [Peer-reviewed]
  Scientific journal
• In-plane anisotropy of single- q and multiple- q ordered phases in the antiferromagnetic metal CeRh2Si2
  Saito, H.; Kon, F.; Hidaka, H.; Amitsuka, H.; Kwanghee, C.; Hagihala, M.; Kamiyama, T.; Itoh, S.; Nakajima, T.
  Physical Review B, 108, 9, 28 Sep. 2023, [Peer-reviewed]
  Scientific journal
• Elemental Dilution Effect on the Elastic Response due to a Quadrupolar Kondo Effect of the Non-Kramers System Y1−xPrxIr2Zn20
  Ruo Hibino; Tatsuya Yanagisawa; Yoshito Mikami; Hiroyuki Hidaka; Hiroshi Amitsuka; Sergei Zherlitsyn; Joachim Wosnitza; Yu Yamane; Takahiro Onimaru
  Journal of the Physical Society of Japan, 15 Jul. 2023, [Peer-reviewed]
  Scientific journal
• Correlation between antiferromagnetic and charge-density-wave order in UPt$_{2}$Si$_{2}$ studied by resonant X-Ray scattering
  Fusako Kon; Chihiro Tabata; Kodai Miura; Ruo Hibino; Hiroyuki Hidaka; Tatsuya Yanagisawa; Hironori Nakao; Hiroshi Amitsuka
  SciPost Physics Proceedings, 11, Stichting SciPost, 05 Jun. 2023
  Scientific journal, Relationship between antiferromagnetic order with Néel temperature of 35 K and charge-density-wave (CDW) order below 320 K of UPt_2Si_2 has been investigated by resonant X-ray scattering measurements. We have found that a resonant scattering signal develops below the Néel temperature at the { M}_{ 4} absorption edge of uranium with a propagation vector of the CDW order { q}_{ CDW} \sim (0.42, 0, 0). The experimental results reveal that the magnetic structure of UPt_2Si_2 is modulated by the CDW ordering.
• Lattice Instability of UTe₂ Studied by Ultrasonic Measurements
  Keita Ushida; Tatsuya Yanagisawa; Ruo Hibino; Masato Matsuda; Hiroyuki Hidaka; Hiroshi Amitsuka; Georg Knebel; Jacques Flouquet; Dai Aoki
  Proceedings of the 29th International Conference on Low Temperature Physics (LT29), Journal of the Physical Society of Japan, 22 May 2023, [Peer-reviewed]
  International conference proceedings
• Change in the Ground State of Y_1−xPr_xIr₂Zn₂₀ due to a Quadrupolar Kondo Effect with Pr Concentration x
  Ruo Hibino; Tatsuya Yanagisawa; Yoshito Mikami; Hiroyuki Hidaka; Hiroshi Amitsuka; Sergei Zherlitsyn; Joachim Wosnitza; Yu Yamane; Takahiro Onimaru
  Proceedings of the 29th International Conference on Low Temperature Physics (LT29), Journal of the Physical Society of Japan, 22 May 2023, [Peer-reviewed]
  International conference proceedings
• Magnetic Field–Temperature Phase Diagram of CeCoSi Constructed on the Basis of Specific Heat, Magnetoresistivity, and Magnetization Measurements: Single Crystal Study
  Hiroyuki Hidaka; Shun Yanagiya; Eikai Hayasaka; Yuma Kaneko; Tatsuya Yanagisawa; Hiroshi Tanida; Hiroshi Amitsuka
  Journal of the Physical Society of Japan, 91, 9, Physical Society of Japan, 15 Sep. 2022, [Peer-reviewed], [Last author]
  English, Scientific journal
• Possible Magnetic Structure with a Tilted Helical Plane in SmBe13 Probed by 9Be-NMR Study
  Hiroyuki Hidaka; Yoshihiko Ihara; Tatsuya Yanagisawa; Hiroshi Amitsuka
  JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 90, 9, Sep. 2021, [Peer-reviewed], [Last author]
  English, Scientific journal
• X-ray Crystal Structure Analysis of Magnetoelectric Metal UNi4B
  Chihiro Tabata; Hajime Sagayama; Hiraku Saito; Hironori Nakao; Hiroshi Amitsuka
  JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 90, 6, Jun. 2021, [Peer-reviewed], [Last author]
  English, Scientific journal
• Crystallographic and magnetic structure of UNi4 B-11
  J. Willwater; S. Sullow; M. Reehuis; R. Feyerherm; H. Amitsuka; B. Ouladdiaf; E. Suard; M. Klicpera; M. Valiska; J. Pospisil; Sechovsky, V
  PHYSICAL REVIEW B, 103, 18, May 2021, [Peer-reviewed]
  English, Scientific journal
• Electric Quadrupolar Contributions in the Magnetic Phases of UNi4B
  T. Yanagisawa; H. Matsumori; H. Saito; H. Hidaka; H. Amitsuka; S. Nakamura; S. Awaji; D. Gorbunov; S. Zherlitsyn; J. Wosnitza; K. Uhlirova; M. Valiska; Sechovsky, V
  PHYSICAL REVIEW LETTERS, 126, 15, Apr. 2021, [Peer-reviewed]
  English, Scientific journal
• Magnetic and electronic phases of U2Rh3Si5
  J. Willwater; N. Steinki; D. Menzel; R. Reuter; H. Amitsuka; Sechovsky, V; M. Valiska; M. Jaime; F. Weickert; S. Suellow
  PHYSICAL REVIEW B, 103, 5, Feb. 2021, [Peer-reviewed]
  English, Scientific journal
• Helical magnetic ordering studied in single-crystalline GdBe13
  Hiroyuki Hidaka; Kota Mizuuchi; Eikai Hayasaka; Tatsuya Yanagisawa; Jun Ohara; Hiroshi Amitsuka
  PHYSICAL REVIEW B, 102, 17, Nov. 2020, [Peer-reviewed], [Last author]
  English, Scientific journal
• Quadrupolar susceptibility and magnetic phase diagram of PrNi2Cd20 with non-Kramers doublet ground state
  Tatsuya Yanagisawa; Hiroyuki Hidaka; Hiroshi Amitsuka; Shintaro Nakamura; Satoshi Awaji; Elizabeth L. Green; Sergei Zherlitsyn; Joachim Wosnitza; Duygu Yazici; Benjamin D. White; M. Brian Maple
  PHILOSOPHICAL MAGAZINE, 100, 10, 1268, 1281, May 2020, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
  English, Scientific journal
• Magnetic Phase Diagram of Helical Magnet GdBe13
  Hiroyuki Hidaka; Kota Mizuuchi; Tatsuya Yanagisawa; Hiroshi Amitsuka
  Proceedings of the International Conference on Strongly Correlated Electron Systems (SCES2019), Journal of the Physical Society of Japan, 19 Mar. 2020, [Peer-reviewed], [Last author]
  International conference proceedings
• 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 Amitsuka
  JPS Conf. Proc, 30, 011115-1, 011115-6, 19 Mar. 2020, [Peer-reviewed]
  English, International conference proceedings
• Linearly Polarized Hard X-Ray Photoemission Spectroscopy of PrBe13
  Satoru Hamamoto; Yuina Kanai-Nakata; Hidenori Fujiwara; Kentaro Kuga; Takayuki Kiss; Atsushi Higashiya; Atsushi Yamasaki; Shin Imada; Arata Tanaka; Kenji Tamasaku; Makina Yabashi; Tetsuya Ishikawa; Hiroyuki Hidaka; Tatsuya Yanagisawa; Hiroshi Amitsuka; Akira Sekiyama
  Proceedings of J-Physics 2019: International Conference on Multipole Physics and Related Phenomena, Journal of the Physical Society of Japan, 13 Feb. 2020, [Peer-reviewed]
  International conference proceedings
• Logarithmic Elastic Response in the Dilute Non-Kramers System Y1−xPrxIr2Zn20
  Tatsuya Yanagisawa; Hiroyuki Hidaka; Hiroshi Amitsuka; Sergei Zherlitsyn; Joachim Wosnitza; Yu Yamane; Takahiro Onimaru
  Proceedings of J-Physics 2019: International Conference on Multipole Physics and Related Phenomena, Journal of the Physical Society of Japan, 13 Feb. 2020, [Peer-reviewed]
  International conference proceedings
• Observation of the 4f ground-state symmetry in strongly correlated cubic Pr compounds probed by linearly polarized 3d core-level photoemission spectroscopy
  S. Hamamoto; Y. Kanai; S. Fujioka; Y. Nakatani; H. Fujiwara; K. Kuga; T. Kiss; A. Higashiya; A. Yamasaki; S. Imada; A. Tanaka; K. Tamasaku; M. Yabashi; T. Ishikawa; H. Hidaka; T. Yanagisawa; H. Amitsuka; K. T. Matsumoto; T. Onimaru; T. Takabatake; A. Sekiyama
  JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA, 238, Jan. 2020, [Peer-reviewed]
  English, Scientific journal
• Evidence for the Single-Site Quadrupolar Kondo Effect in the Dilute Non-Kramers System Y1-xPrxIr2Zn20
  T. Yanagisawa; H. Hidaka; H. Amitsuka; S. Zherlitsyn; J. Wosnitza; Y. Yamane; T. Onimaru
  PHYSICAL REVIEW LETTERS, 123, 6, Aug. 2019, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
  English, Scientific journal
• Magnetic, Transport, and Phonon Properties of the Trivalent Eu Metallic Compound EuBe13
  Hiroyuki Hidaka; Kota Mizuuchi; Tatsuya Yanagisawa; Hiroshi Amitsuka
  JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 88, 3, Mar. 2019, [Peer-reviewed], [International Magazine]
  English, Scientific journal
• Hall Effect and Resistivity in Epitaxial MnSi Thin Films Under Ambient and High Pressure
  D. Menzel; D. Schroeter; N. Steinki; S. Suellow; A. Fernandez Scarioni; H. W. Schumacher; H. Okuyama; H. Hidaka; H. Amitsuka
  IEEE TRANSACTIONS ON MAGNETICS, 55, 2, 1500204, Feb. 2019, [Peer-reviewed]
  English, Scientific journal
• Uncompensated Antiferromagnetic Ordering of UAu2Si2 Studied by Si-29-NMR
  Chihiro Tabata; Yoshihiko Ihara; Shogo Shimmura; Naoyuki Miura; Hiroyuki Hidaka; Tatsuya Yanagisawa; Hiroshi Amitsuka
  JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 87, 11, 15 Nov. 2018, [Peer-reviewed]
  English, Scientific journal
• Magnetoelastic phenomena in antiferromagnetic uranium intermetallics: The UAu2Si2 case
  M. Valiska; H. Saito; T. Yanagisawa; C. Tabata; H. Amitsuka; K. Uhlirova; J. Prokleska; P. Proschek; J. Valenta; M. Misek; D. Gorbunov; J. Wosnitza; Sechovsky, V
  PHYSICAL REVIEW B, 98, 17, Nov. 2018, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
  English, Scientific journal
• Superconductivity in single crystalline ThBe13 and LuBe13
  Klara Uhlirova; Naoyuki Miura; Vladimir Tkac; Jan Prokleska; Maciej Chrobak; Zbigniew Tarnawski; Hiroyki Hidaka; Tatsuya Yanagisawa; Vladimir Sechovsky; Hiroshi Amitsuka
  PHYSICA B-CONDENSED MATTER, 536, 516, 518, May 2018, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
  English, Scientific journal
• Low-temperature x-ray crystal structure analysis of the cage-structured compounds MBe13 (M = La, Sm, and U)
  Hiroyuki Hidaka; Ryoma Nagata; Chihiro Tabata; Yusei Shimizu; Naoyuki Miura; Tatsuya Yanagisawa; Hiroshi Amitsuka
  PHYSICAL REVIEW MATERIALS, 2, 5, 053603-1, 053603-7, May 2018, [Peer-reviewed]
  English, Scientific journal
• Magnetic anisotropy on the single crystal UNi4B probed by B-11 NMR
  Yasuki Kishimoto; Haruki Matsuno; Hisashi Kotegawa; Hideki Tou; Hiraku Saito; Hiroshi Amitsuka; Yoshiya Homma; Ai Nakamura; Dexin Li; Fuminori Honda; Dai Aoki
  PHYSICA B-CONDENSED MATTER, 536, 564, 566, May 2018, [Peer-reviewed]
  English, Scientific journal
• Search for multipolar instability in URu2Si2 studied by ultrasonic measurements under pulsed magnetic field
  T. Yanagisawa; S. Mombetsu; H. Hidaka; H. Amitsuka; P. T. Cong; S. Yasin; S. Zherlitsyn; J. Wosnitza; K. Huang; N. Kanchanavatee; M. Janoschek; M. B. Maple; D. Aoki
  PHYSICAL REVIEW B, 97, 15, 155137, Apr. 2018, [Peer-reviewed]
  English, Scientific journal
• Evidence of a New Current-Induced Magnetoelectric Effect in a Toroidal Magnetic Ordered State of UNi4B
  Hiraku Saito; Kenta Uenishi; Naoyuki Miura; Chihiro Tabata; Hiroyuki Hidaka; Tatsuya Yanagisawa; Hiroshi Amitsuka
  JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 87, 3, 33702, Mar. 2018, [Peer-reviewed], [International Magazine]
  English, Scientific journal
• Neutron diffraction study on single-crystalline UAu2Si2
  Chihiro Tabata; Milan Klicpera; Bachir Ouladdiaf; Hiraku Saito; Michal Valiska; Klara Uhlirova; Naoyuki Miura; Vladimir Sechovsky; Hiroshi Amitsuka
  PHYSICAL REVIEW B, 96, 21, Dec. 2017, [Peer-reviewed]
  English, Scientific journal
• Sm valence states and magnetic properties in SmBe13 and SmTi2Al20 investigated by Sm synchrotron-radiation-based Mossbauer spectroscopy
  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 Aoki
  HYPERFINE INTERACTIONS, 238, 1, 100, Nov. 2017, [Peer-reviewed]
  English, International conference proceedings
• Magnetically Ordered State and Crystalline-Electric-Field Effects in SmBe13
  Hiroyuki Hidaka; Seigo Yamazaki; Yusei Shimizu; Naoyuki Miura; Chihiro Tabata; Tatsuya Yanagisawa; Hiroshi Amitsuka
  JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 86, 7, 074703-1, 074703-6, Jul. 2017, [Peer-reviewed]
  English, Scientific journal
• Observation of Low-Energy Einstein Phonon and Superconductivity in Single-Crystalline LaBe13
  Hiroyuki Hidaka; Yusei Shimizu; Seigo Yamazaki; Naoyuki Miura; Ryoma Nagata; Chihiro Tabata; Shota Mombetsu; Tatsuya Yanagisawa; Hiroshi Amitsuka
  JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 86, 2, 023704-1, 023704-4, Feb. 2017, [Peer-reviewed]
  English, Scientific journal
• Trial for the Data-oriented management using data-set of Equipment sharing in Hokkaido University
  Maiku Abe; Shingo Ebata; Hiroshi Amitsuka; Hiromitsu Uehara; Satomi Tajima; Tomokazu Yoshizawa
  16TH INTERNATIONAL CONFERENCE ON SCIENTOMETRICS & INFORMETRICS (ISSI 2017), 1676, 1677, 2017, [Peer-reviewed]
  English, International conference proceedings
• Peculiar magnetism of UAu2Si2
  Chihiro Tabata; Naoyuki Miura; Klara Uhlirova; Michal Valiska; Hiraku Saito; Hiroyuki Hidaka; Tatsuya Yanagisawa; Vladimir Sechovsky; Hiroshi Amitsuka
  PHYSICAL REVIEW B, 94, 21, Dec. 2016, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
  English, Scientific journal
• Study of localized character of 4 f electrons and ultrasonic dispersions in SmOs4Sb12 by high-pressure high-frequency ultrasonic measurements
  S. Mombetsu; T. Murazumi; H. Hidaka; T. Yanagisawa; H. Amitsuka; P. -C. Ho; M. B. Maple
  PHYSICAL REVIEW B, 94, 8, Aug. 2016, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
  English, Scientific journal
• Synchrotron Radiation Mossbauer Spectroscopy Using Sm-149 Nuclei
  Satoshi Tsutsui; Ryo Masuda; Yasuhiro Kobayashi; Yoshitaka Yoda; Kota Mizuuchi; Yusei Shimizu; Hiroyuki Hidaka; Tatsuya Yanagisawa; Hiroshi Amitsuka; Fumitoshi Iga; Makoto Seto
  JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 85, 8, 083704, Aug. 2016, [Peer-reviewed]
  English, Scientific journal
• Crystalline Electric Field and Kondo Effect in SmOs4Sb12
  Shota Mombetsu; Tatsuya Yanagisawa; Hiroyuki Hidaka; Hiroshi Amitsuka; Shadi Yasin; Sergei Zherlitsyn; Jochen Wosnitza; Pei-Chun Ho; M. Brian Maple
  JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 85, 4, Apr. 2016, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
  English, Scientific journal
• Heat capacity measurements on UB13 in rotated magnetic fields: Anisotropic response in the normal state and absence of nodal quasiparticles
  Yusei Shimizu; Shunichiro Kittaka; Toshiro Sakakibara; Yoshinori Haga; Etsuji Yamamoto; Hiroshi Amitsuka; Yasumasa Tsutsumi; Kazushige Machida
  JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 400, 52, 55, 15 Feb. 2016, [Peer-reviewed]
  English, Scientific journal
• Magnetic anisotropy and thermodynamic anomaly in the superconducting mixed state of UBe13 probed by static dc magnetization measurements
  Yusei Shimizu; Yoshinori Haga; Tatsuya Yanagisawa; Hiroshi Amitsuka
  PHYSICAL REVIEW B, 93, 2, 06 Jan. 2016, [Peer-reviewed]
  English, Scientific journal
• Magnetic anisotropy and thermodynamic anomaly in the superconducting mixed state of UBe13 probed by static dc magnetization measurements
  Yusei Shimizu; Yoshinori Haga; Tatsuya Yanagisawa; Hiroshi Amitsuka
  Physical Review B, 93, 2, Jan. 2016, [Peer-reviewed], [International Magazine]
  English, Scientific journal
• Discovery of the Pt-Based Superconductor LaPt5As
  Masaya Fujioka; Manabu Ishimaru; Taizo Shibuya; Yoichi Kamihara; Chihiro Tabata; Hiroshi Amitsuka; Akira Miura; Masashi Tanaka; Yoshihiko Takano; Hideo Kaiju; Junji Nishii
  JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 138, 31, 9927, 9934, 2016, [Peer-reviewed]
  Scientific journal
• High Magnetic Field Study of Elastic Constants of the Cage-structure Compound SmBe13
  S. Mombetsu; T. Murazumi; K. Hiura; S. Yamazaki; Y. Shimizu; H. Hidaka; T. Yanagisawa; H. Amitsuka; S. Yasin; S. Zherlitsyn; J. Wosnitza
  TMU INTERNATIONAL SYMPOSIUM ON NEW QUANTUM PHASES EMERGING FROM NOVEL CRYSTAL STRUCTURE, 683, 012032-1, 012032-6, 2016, [Peer-reviewed]
  English, International conference proceedings
• Magnetic ground-state properties of noncentrosymmetric CePt3B1-xSix
  D. Rauch; P. Horenburg; S. Hartwig; F. J. Litterst; S. Suellow; H. Luetkens; C. Baines; S. Yamazaki; H. Hidaka; H. Amitsuka; E. Bauer
  PHYSICAL REVIEW B, 92, 11, 08 Sep. 2015, [Peer-reviewed]
  English, Scientific journal
• Pressure temperature phase diagram of CeAg
  Hiroyuki Hidaka; Shinya Otani; Hiraku Saito; Kaori Tatsumi; Tatsuya Yanagisawa; Hiroshi Amitsuka
  JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 385, 428, 432, Jul. 2015, [Peer-reviewed], [International Magazine]
  English, Scientific journal
• Field-Orientation Dependence of Low-Energy Quasiparticle Excitations in the Heavy-Electron Superconductor UBe13
  Yusei Shimizu; Shunichiro Kittaka; Toshiro Sakakibara; Yoshinori Haga; Etsuji Yamamoto; Hiroshi Amitsuka; Yasumasa Tsutsumi; Kazushige Machida
  PHYSICAL REVIEW LETTERS, 114, 14, 147002-1, 147002-6, Apr. 2015, [Peer-reviewed]
  English, Scientific journal
• Ultrasonic Investigation of Magnetic Ordering with Higher-Order Interactions in the Cage-Structured Compound U3Pd20Si6
  Tatsuya Yanagisawa; Kenta Hiura; Shota Mombetsu; Taro Murazumi; Hiroyuki Hidaka; Hiroshi Amitsuka; Naoyuki Tateiwa; Yoshinori Haga
  INTERNATIONAL CONFERENCE ON STRONGLY CORRELATED ELECTRON SYSTEMS 2014 (SCES2014), 592, 012095-1, 012095-8, 2015, [Peer-reviewed]
  English, International conference proceedings
• X-ray backscattering study of crystal lattice distortion in hidden order of URu2Si2
  C. Tabata; T. Inami; S. Michimura; M. Yokoyama; H. Hidaka; T. Yanagisawa; H. Amitsuka
  PHILOSOPHICAL MAGAZINE, 94, 32-33, 3691, 3701, Nov. 2014, [Peer-reviewed], [International Magazine]
  English, Scientific journal
• Suppressed magnetic order and non-Fermi-liquid behavior in MnSi thin films under hydrostatic pressure
  J. Engelke; D. Menzel; H. Hidaka; T. Seguchi; H. Amitsuka
  PHYSICAL REVIEW B, 89, 14, 144413, Apr. 2014, [Peer-reviewed]
  English, Scientific journal
• Polarized Light Microscopic Study of the Hidden Order Phase in URu2Si2
  Chihiro Tabata; Masashi Tokunaga; Makoto Yokoyama; Hiroyuki Hidaka; Tatsuya Yanagisawa; Hiroshi Amitsuka
  JPS Conf. Proc., 3, 011062, 2014, [Peer-reviewed]
  English, International conference proceedings
• Simultaneous Measurements of Elastic Constant and Resistivity near the Tc of Non-BCS-Type Superconductor PrOs4Sb1
  Shota Mombetsu; Taro Murazumi; Kenta Hiura; Hiroyuki Hidaka; Tatsuya Yanagisawa; Hiroshi Amitsuka; M. Brian Maple
  JPS Conf. Proc., 3, 015021, 2014, [Peer-reviewed]
  English, International conference proceedings
• DC Magnetization Study on Heavy-Electron Superconductor UBe13
  Yusei SHIMIZU; Yoshinori HAGA; Tatsuya YANAGISAWA; Hiroshi AMITSUKA; Dai AOKI; Jean-Pascal BRISON; Daniel BRAITHWAITE
  JPS Conf. Proc., 3, 015009-1, 015009-6, 2014, [Peer-reviewed]
  English, International conference proceedings
• Investigation of Local Symmetries in the Hidden-Order Phase of URu2Si2
  Takeshi Mito; Midori Hattori; Gaku Motoyama; Yoshio Sakai; Takehide Koyama; Koichi Ueda; Takao Kohara; Makoto Yokoyama; Hiroshi Amitsuka
  JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 82, 12, Dec. 2013, [Peer-reviewed]
  English, Scientific journal
• Hybridization-driven orthorhombic lattice instability in URu 2Si2
  T. Yanagisawa; S. Mombetsu; H. Hidaka; H. Amitsuka; M. Akatsu; S. Yasin; S. Zherlitsyn; J. Wosnitza; K. Huang; M. Janoschek; M. B. Maple
  Physical Review B - Condensed Matter and Materials Physics, 88, 19, 26 Nov. 2013
  Scientific journal
• Hybridization-driven orthorhombic lattice instability in URu2Si2
  T. Yanagisawa; S. Mombetsu; H. Hidaka; H. Amitsuka; M. Akatsu; S. Yasin; S. Zherlitsyn; J. Wosnitza; K. Huang; M. Janoschek; M. B. Maple
  PHYSICAL REVIEW B, 88, 19, 195150-1, 195150-5, Nov. 2013, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
  English, Scientific journal
• Superconducting Properties of Noncentrosymmetric Superconductor LaPt3Si Studied by Muon Spin Spectroscopy
  Ikuto Kawasaki; Isa Watanabe; Hiroshi Amitsuka; Keisuke Kunimori; Hiroshi Tanida; Yoshichika Onuki
  JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 82, 8, Aug. 2013, [Peer-reviewed]
  English, Scientific journal
• Gamma(3)-Type Lattice Instability and the Hidden Order of URu2Si2
  Tatsuya Yanagisawa; Shota Mombetsu; Hiroyuki Hidaka; Hiroshi Amitsuka; Mitsuhiro Akatsu; Shadi Yasin; Sergei Zherlitsyn; Jochen Wosnitza; Kevin Huang; M. Brian Maple
  JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 82, 1, Jan. 2013, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
  English, Scientific journal
• Neutron Scattering Study on Commensurate and Incommensurate Antiferromagnetic Phases in UPd2Si2 under Uniaxial Stress
  Takahiro Nakada; Makoto Yokoyama; Chihiro Tabata; Hideki Igarashi; Hiroyuki Hidaka; Hiroshi Amitsuka; Kenichi Tenya; Taku J. Sato
  JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 81, SUPPL.B, SB020(1), SB020(4), Dec. 2012, [Peer-reviewed]
  English, Scientific journal
• Observation of an Unusual Magnetic Anomaly in the Superconducting Mixed State of Heavy-Fermion Compound UBe13 by Precise dc Magnetization Measurements
  Yusei Shimizu; Yoshinori Haga; Yoichi Ikeda; Tatsuya Yanagisawa; Hiroshi Amitsuka
  PHYSICAL REVIEW LETTERS, 109, 21, 20 Nov. 2012, [Peer-reviewed]
  English, Scientific journal
• Symmetry of the Hidden Order in URu2Si2 from Nuclear Magnetic Resonance Studies
  Shigeru Takagi; Shu Ishihara; Makoto Yokoyama; Hiroshi Amitsuka
  JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 81, 11, Nov. 2012, [Peer-reviewed]
  English, Scientific journal
• A Study of Ni-Substitution Effects on Heavy-Fermion CeCu2Si2 -Similarities between Ni Substitution and High-Pressure Effects
  Yoichi Ikeda; Shingo Araki; Tatsuo C. Kobayashi; Yusei Shimizu; Tatsuya Yanagisawa; Hiroshi Amitsuka
  JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 81, 8, 083701-1, 083701-4, Aug. 2012, [Peer-reviewed]
  English, Scientific journal
• NMR and NQR investigations of local symmetry in the hidden order phase of URu2Si2
  T. Mito; M. Hattori; G. Motoyama; Y. Sakai; T. Koyama; K. Ueda; T. Kohara; M. Yokoyama; H. Amitsuka
  INTERNATIONAL CONFERENCE ON STRONGLY CORRELATED ELECTRON SYSTEMS (SCES 2011), 391, 2012
  English, International conference proceedings
• Effects of Pressure on Cage-Structural Compound Ce3Pd20Ge6
  H. Hidaka; S. M. Ramos; E. N. Hering; M. B. Fontes; E. B. Saitovitch; S. Otani; T. Wakabayashi; Y. Shimizu; T. Yanagisawa; H. Amitsuka
  INTERNATIONAL CONFERENCE ON STRONGLY CORRELATED ELECTRON SYSTEMS (SCES 2011), 391, 012019-1, 012019-4, 2012, [Peer-reviewed]
  English, International conference proceedings
• A Study of Elastic Properties of URu2Si2 in Comparison with the Non-5f Contribution of ThRu2Si2
  T. Yanagisawa; H. Saito; Y. Watanabe; Y. Shimizu; H. Hidaka; H. Amitsuka
  INTERNATIONAL CONFERENCE ON STRONGLY CORRELATED ELECTRON SYSTEMS (SCES 2011), 391, 012079-1, 012079-4, 2012, [Peer-reviewed]
  English, International conference proceedings
• Anomalous Upper Critical Field in the Heavy-Fermion Superconductor UBe13 Studied by DC Magnetization Measurements
  Yusei Shimizu; Yoshinori Haga; Kenichi Tenya; Tatsuya Yanagisawa; Hiroyuki Hidaka; Hiroshi Amitsuka
  INTERNATIONAL CONFERENCE ON STRONGLY CORRELATED ELECTRON SYSTEMS (SCES 2011), 391, 2012, [Peer-reviewed]
  English, International conference proceedings
• Magnetic properties of the triangular quantum spin tube .
  In CePt_2Si_2, the (100) axis magnetization changes its slope at B-3T, however, no sharp metamagnetic transition has been observed down to 0.3K.
  In TmTe, an unusaul hysteresis has been found in the magnetization of the paramagnetic phase below 1.5K.We attribute this to an occurrence of quadrupolar ordering of the GAMMA_8 ground state of this compound around T-1.7K.
  Japan Society for the Promotion of Science, Grant-in-Aid for General Scientific Research (B), (Faculty of Science) Hokkaido University, 04452030
• 常磁性金属におけるメタ磁性転移と電子相関
  科学研究費助成事業
  1991 - 1991
  榊原 俊郎; 綱塚 浩
  メタ磁性を示す常磁性金属(強磁性寸前のdーバンドメタルや近藤格子ヘビ-フェルミオン系)に最近興味が持たれている。本研究では代表的ヘビ-フェルミオン物質であるCeRu_2Si_2に注目し、そのメタ磁性の機構を探るための実験を行なった。
  CeRu_2Si_2のメタ磁性は圧力効果などから転移磁場B^*が近藤温度T_Kでよくスケ-ルされると考えられているが、サイト間のスピン相関やcoherencyがどの程度効いているかは明かでない。サイト間相関の影響を調べるには希釈法を調べるのが一つの方法だが、CeRu_2Si_2の場合、例えばLaで希釈すると体積膨張のためにT_Kが下がる効果が大きく、希釈効果そのものはよく解からない。そこで我々はLa置換とY置換とで格子定数がほぼ逆の変化をする点に着目し、LaとYを適当な割合(約6対4)で同時にCeと置換することにより、T_Kがほぼ一定の擬三元系単結晶Ce_<1ーX>(La_<0.6>Y_<0.4>)_XRu_2Si_2をトリア-ク炉により作成し、実験を行なった。
  X線回析では格子定数の有意な変化は見られなかった。比熱測定の結果、低温におけるC/TはCeあたりに規格化するとほぼ同じ曲線に乗り、予想どおり特性温度はほとんど変化しない結果を得た。CeRu_2Si_2はB^*=7.8Tに転移磁場を持つが、8Tまでの磁化測定の結果、希釈しても転移磁場が殆どシフトしないことがわかった。従ってB^*∝γ^<-1>が希釈系でもよく成立していることになる。この結果はスピン間相互作用を単に分子場で取り入れたモデルでは理解しにくい。一方転移の幅は急速にブロ-ドになり、20%希釈で転移はほぼ消えている。またCeRu_2Si_2はcー軸磁化率χ_cに特徴的なピ-クを約10Kに持つが、実験の結果、この構造もわずかな希釈によって急速に壊されることが示された。すなわちこれらの現象はCeサイトの周期性の破壊に極めて敏感であることが示唆される。以上、この物質におけるメタ磁性転移の機構を確立する上で極めて重要な情報が得られた。
  日本学術振興会, 一般研究(C), 北海道大学, 03640288
• 重い電子系における電子相関競合状態の圧力効果:低温高圧下比熱測定
  科学研究費助成事業 奨励研究(A)
  1991 - 1991
  網塚 浩
  日本学術振興会, 奨励研究(A), 北海道大学, 03740155
• Research on Magnetism and Superconductivity of Rare Earth and Actinide Compounds
  Grants-in-Aid for Scientific Research Grant-in-Aid for international Scientific Research
  1990 - 1991
  MIYAKO Yoshihito; RATRICK Pari; SOULETIE Jean; SAKAKIBARA Toshiro; YAMAGISHI Akio; ASAYAMA Kunisuke; DATE Muneyuki; OCIO Miguel; THOLENCE Jean L.; FLOUQUET Jacques
  Research on magnetic and superconducting properties of rare earth and actinide compounds is the most interesting subject. In this field, there was remarkable progress for last 10 years and still exciting discoveries and theoretical development are continuously in progress.
  On the other hand, the fruitful results are in enthusiastic anticipation for the application to modern technology.
  In the new exotic superconductivity in rare earth and actinide compounds, there is an interplay between magnetism and superconductivity.
  In this system, the magnetic and superconducting properties show many aspects corresponding to experimental condition, For this study, mutually supplementary research techniques are required.
  Grenoble is the research center of European community where 20, 000 people are engaged in fundamental research work. By the collaboration with Dr. J. Flouquet and his group, we have a merit to perform neutron scattering and heat capacity experiments down to 50mK in addition to the experiments of our Japanese side, as SQUID magnetization, NMR, specific heat measurement and the experiment under and ultra-high pulse magnetic field.
  The purpose of our international collaboration is concerned with the research on the interplay between magnetism and superconductivity and the magnetic properties in the coexisting system of quadrupolar and exchange interactions.
  Japan Society for the Promotion of Science, Grant-in-Aid for international Scientific Research, 02044004
• 弱い反強磁性を示すウラン系ヘビ-フェルミオンの磁気相図
  科学研究費助成事業 重点領域研究
  1990 - 1990
  榊原 俊郎; 網塚 浩
  ウラン系ヘビ-フェルミオン化合物はそのほとんどが反強磁性スピン相関を示し、またそれが超伝導転移やメタ磁性転移と関係していると考えられている。従って、磁気相図を詳しく調べること重要な課題である。本研究では典型物質の一つであるURu_2Si_2、および関連物質においてこれまで研究の少ない有限温度・有限磁場の磁気相関を詳しく調べた。以下、概要を述べる。
  (1)帯磁率極大とメタ磁性:URu_2Si_2の特微の一つにTmax〜60K付近の帯磁率の大きな山がある。強磁場磁化測定の結果、Tmax以下の温度で磁化過程が非線型性を示し、低温でのメタ磁性へと移行することがわかった。このようなTmaxの原因としては結晶場や反強磁性相関が考えられるが、UをLaやYで薄めていくと消えることから反強磁性相関の可能性が強い。
  (2)メタ磁性とSDWエネルギ-:URu_2Si_2の基底状態はT_N=17.5KのSDW状態であると考えられている。一方、低温で見られる鋭いメタ磁性はヘビ-フェルミオン状態からスピン分極した状態への転移と考えられているので、その転移磁場Hc_1にはSDW凝縮エネルギ-が寄与しているはずである。そこで、RuをRhで置換したU(Ru_<1ーX>Rh_X)_2Si_2の相図を詳しく調べた結果、Hc_1はT_Nと相関がありRh置換によりT_Nが低下するにつれてHc_1も下がることが説明された。また、Hc_1の温度変化を詳しく調べたところ、ほぼT^2に比例して低磁場側にシフトしていくことがわかった。これは系の電子比熱がメタ磁性転移とともに増大していることを意味するが、その原因としてSDWギャップが消失したと考えると説明可能である。従って、H【greater than or similar】Hc_1においてもヘビ-フェルミオン状態にある可能性がある。
  日本学術振興会, 重点領域研究, 北海道大学, 02216201
• 希土類およびアクチノイドを含む強相関電子系の極低温物性
  Competitive research funding