Syntheses of New 2-Dimensional Itinerant-Electron Compounds and Search for Novel Physical Properties

2012 Fiscal Year Final Research Report

• Project/Area Number: 22350029
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Inorganic chemistry
• Research Institution: Kyoto University
• Principal Investigator: YOSHIMURA Kazuyoshi 京都大学, 大学院・理学研究科, 教授 (70191640)
• Co-Investigator(Kenkyū-buntansha): MICHIOKA Chishiro 京都大学, 大学院・理学研究科, 助教 (70378595)
• Project Period (FY): 2010 – 2012
• Keywords: 無機固体化学 / 遍歴電子化合物 / 強相関電子系化合物 / 二次元電子系 / 遍歴磁性 / 超伝導 / スピン揺らぎ / スピンフラストレーション

Research Abstract

The research on 2-dimensional itinerant-electron systems has been conducted in order to investigate and to establish novel 2-dimensional itinerant-electron systems by controlling the electronic states of transition-metal elements. As a result, we newly found the itinerant-electron metamagnetic transitions around 60 T in the high-fieldmagnetization process of SrCo2P2. By substituting Ca for Sr, the system was found to approach the QCP of the 2D itinerant ferromagnetism. In the 2-dimensional superconductingsystem Fe(Te-Se), furthermore, physical properties were investigated by utilizing 125Te NMR. Consequently, the mechanism of this superconductivity was found to be due to the antiferromagnetic spin-fluctuation.

Research Products

• [Journal Article] Magnetic properties of layered compounds LnCoAsO (Ln = lanthanoids) with itinerant-electron ferromagnetism (2012)
  • Author(s): Hiroto Ohta, Chishiro Michioka and Kazuyoshi Yoshimura
  • Journal Title: Journal of Physics Volume: 344 Pages: 012025/1-7
  • DOI: DOI:10.1088/1742-6596/344/1/012025
  • Peer Reviewed
• [Journal Article] Magnetic Properties of Itinerant Ferromagnet La12Fe57.5As41 (2012)
  • Author(s): Bin Chen, JinHu Yang, Sho Takehara, Hiroto Ohta, Chishiro Michioka, Kazuyoshi Yoshimura
  • Journal Title: Journal of Physics Volume: 344 Pages: 012019/1-4
  • DOI: DOI:10.1088/1742-6596/344/1/012019
  • Peer Reviewed
• [Journal Article] An oxyhydride of BaTiO3 exhibiting hydride exchange and electronic conductivity (2012)
  • Author(s): Yoji Kobayashi, Olivier J. Hernandez, Tatsunori Sakaguchi, Takeshi Yajima, Thierry Roisnel, Yoshihiro Tsujimoto, Masaki Morita, Yasuto Noda, Yuuki Mogami, Atsushi Kitada, Masatoshi Ohkura, Saburo Hosokawa, Zhaofei Li, Katsuro Hayashi, Yoshihiro Kusano, Ju
  • Journal Title: Nature Materials Pages: 3302/1-5
  • DOI: DOI:10.1038/NMAT3302
  • Peer Reviewed
• [Journal Article] (Sr1-xBax)FeO2 (0.4 <= x <= 1): a New Oxygen-Deficient Perovskite Structure (2012)
  • Author(s): Takafumi Yamamoto, Yoji Kobayashi, Naoaki Hayashi, Cedric Tassel, Takashi Saito, Shoji Yamanaka, Mikio Takano, Kenji Ohoyama, Yuichi Shimakawa, Kazuyoshi Yoshimura, and Hiroshi Kageyama
  • Journal Title: J. Am. Chem. Soc Volume: 134 Pages: 11444-11454
  • DOI: DOI:10.1021/ja3007403
  • Peer Reviewed
• [Journal Article] Superlattice Quantum Critical Point in the Cubic Metal (Sr/Ca)3Ir4Sn13 (2012)
  • Author(s): Lina E. Klintberg, Swee K. Goh, Patricia L. Alireza, Paul J. Saines, David A. Tompsett, Peter W. Logg, Jinhu Yang, Bin Chen, Kazuyoshi Yoshimura, and F. Malte Grosche
  • Journal Title: Phys. Rev. Lett Volume: 109 Pages: 237008/1-5
  • DOI: DOI:10.1103/PhysRevLett.109.237008
  • Peer Reviewed
• [Journal Article] Large magnetoresistance effects in LnCoAsO (Ln = Nd, Sm) with a ferromagnetic- antiferromagnetic transition (2011)
  • Author(s): Hiroto Ohta, Chishiro Michioka and Kazuyoshi Yoshimura
  • Journal Title: Phys. Rev. B Volume: 84 Pages: 134411-1-5
  • DOI: DOI:10.1103/PhysRevB.84.134411
  • Peer Reviewed
• [Journal Article] Determination of the Co Valence in Bilayer Hydrated Superconducting NaxCoO2・yH2O by Soft X-Ray Absorption Spectroscopy (2011)
  • Author(s): H. Ohta, K. Yoshimura, Z. Hu, Y. Y. Chin, H. -J. Lin, H. H. Hsieh, C. T. Chen, L. H. Tjeng
  • Journal Title: Phys. Rev. Lett Volume: 107 Pages: 066404-1-5
  • DOI: DOI:10.1103/PhysRevLett.107.066404
  • Peer Reviewed
• [Journal Article] Macroscopic physical properties and spin dynamics in the layered superconductor Fe1+◇Se1 -xSex (2010)
  • Author(s): C. Michioka, H. Ohta, M. Matsui, J. Yang, K. Yoshimura, M. Fang
  • Journal Title: Phys. Rev. B Volume: 82 Pages: 064506/1-7
  • DOI: DOI:10.1103/PhysRevB.82.064506
  • Peer Reviewed
• [Journal Article] Superconductivity and Itinerant Magnetism in Layered Fe-Chalcogenide and Co-Pnictide Systems
  • Author(s): Kazuyoshi Yoshimura, Chishiro Michioka, and Hiroto Ohta
  • Journal Title: Proceedings of the 2012 Powder Metallurgy World Congress & Exhibition Pages: 16F-T14-19/1-8
  • Peer Reviewed
• [Presentation] Itinerant-Electron Magnetism in Fe(Co)-Based Transition-Metal Pnictide and Chalcogenide Layered Systems (2013)
  • Author(s): K. Yoshimura
  • Organizer: The 11th International Conference on Ferrite(招待講演)
  • Place of Presentation: Okinawa, Japan
  • Year and Date: 20130415-18
• [Presentation] Superconductivity and Itinerant Magnetism in Layered Fe-Chalcogenide and Co-Pnictide Systems (2012)
  • Author(s): Kazuyoshi oshimura
  • Organizer: The 2012 Powder Metallurgy World Congress & Exhibition(口頭発表)
  • Place of Presentation: Yokohama, Japan
  • Year and Date: 20121014-18
• [Presentation] Itinerant-Electron Metamagnetic Transition in layered (Sr-Ca)Co2P2 System (2012)
  • Author(s): K. Yoshimura
  • Organizer: The 10th International Conference on Research in High Magnetic Fields 2012(口頭発表)
  • Place of Presentation: Wuhan, China
  • Year and Date: 20120703-06
• [Presentation] Superconductivity and Itinerant-Electron Magnetism in Fe Chalcogenide and Co Pnictide layered Systems (2012)
  • Author(s): K. Yoshimura
  • Organizer: International Conference on Superconductivity and Magnetism (ICSM2012)(招待講演)
  • Place of Presentation: Istanbul, Turkey
  • Year and Date: 20120429-0504
• [Presentation] Systematic investigations on superconductivity and itinerant magnetism in layered Fe-chalcogenide and Co-pnictide systems (2011)
  • Author(s): Kazuyoshi Yoshimura, Chishiro Michioka, and Hiroto Ohta
  • Organizer: INTERNATIONAL CONFERENCE ON LASER, MATERIALS SCIENCE & COMMUNICATION (ICLMSC-2011) (招待講演)
  • Place of Presentation: Burdwan, India
  • Year and Date: 20111207-09
• [Presentation] Superconductivity and Itinerant-Electron Magnetism in Layered Fe(Co)-Based Chalcogenide and Pnictide Systems (2011)
  • Author(s): Kazuyoshi Yoshimura, Hiroto Ohta, Chishio Michioka, Jinhu Yang and Minghu Fang
  • Organizer: Asian Powder Metallurgy Association (APMA2011)(招待講演)
  • Place of Presentation: Jeju, Korea
  • Year and Date: 20111030-1102
• [Presentation] Superconductivity and Itinerant-Electron Magnetism in layered Fe(Co)-based Chalcogenide and Pnictide Systems (2010)
  • Author(s): Kazuyoshi Yoshimura, Mami Matsui, Masatomo Kawa, Jinhu Yang, Hiroto Ohta, Chishiro Michioka
  • Organizer: 2010環太平洋国際化学会議 (Pacifichem 2010)(口頭発表)
  • Place of Presentation: Hawaii, USA
  • Year and Date: 20101215-20
• [Presentation] Intrinsic magnetization in the novel quasi-two-dimensional superconducting and magnetic Fe1+δTe1-xSex system (2010)
  • Author(s): Kazuyoshi Yoshimura, Chishiro Michioka, Mami Matsui, Hiroto Ohta, Jinhu Yang and Minghu Fang
  • Organizer: International Conference on Magnetic Materials (ICMM-2010)(招待講演)
  • Place of Presentation: Kolkata, India
  • Year and Date: 20101025-29
• [Book] 歴磁性とスピンゆらぎ (2012)
  • Author(s): 高橋慶紀・吉村一良
  • Total Pages: 272
  • Publisher: 内田老鶴圃