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Microscopic study of heterogeneous electronic states by Kondo holes

Research Project

Project/Area Number 17K05522
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Condensed matter physics II
Research InstitutionJapan Atomic Energy Agency

Principal Investigator

Sakai Hironori  国立研究開発法人日本原子力研究開発機構, 原子力科学研究部門 原子力科学研究所 先端基礎研究センター, 研究主幹 (80370401)

Project Period (FY) 2017-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2019: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2018: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2017: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Keywords核磁気共鳴 / 核四重極共鳴 / 近藤空孔 / 物性実験 / 強相関電子系
Outline of Final Research Achievements

Strongly correlated f-electron compound CeCoIn5 substituted slightly by non-magnetic elements for the ligand sites has been investigated by means of nuclear magnetic resonance (NMR) and nuclear quadrupole resonance (NQR) techniques. In the case of Zn-substitutions for the In istes, which correspond to hole-doping, the Zn substituent break the Kondo path of f and conduction electrons and then heterogeneous electronic state appears. In the case of Ni substitutions for the Co sites, a rather homogeneous electronic state is found to appear.

Academic Significance and Societal Importance of the Research Achievements

本研究では、従来研究が磁性原子サイト置換に着目していたのと異なり、 配位子置換が容易に近藤空孔を作ることができること、近藤空孔による不均一電子状態が広く見られることなどを明らかにした。こうした不均一電子状態は、遍歴スピン系や量子スピン系などの強相関d電子系における不純物効果を理解する上でも重要と考えられる。 特に、Yb系で広く観測される2価Yb2+と3価Yb3+の価数揺動状態は、電子正孔対称性から近藤空孔状態との共鳴混成状態と見ることができるため、近年研究が盛んになったYb元素を基に構成された重い電子系の非フェルミ液体的挙動の微視的機構の解明にも寄与するものと考えられる。

Report

(4 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Research-status Report
  • 2017 Research-status Report
  • Research Products

    (8 results)

All 2020 2018 2017 Other

All Int'l Joint Research (3 results) Journal Article (1 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 1 results) Presentation (4 results) (of which Int'l Joint Research: 2 results,  Invited: 1 results)

  • [Int'l Joint Research] Los Alamos National Laboratory/National High Magnetic Field Laboratory(米国)

    • Related Report
      2019 Annual Research Report
  • [Int'l Joint Research] ロスアラモス国立研究所(米国)

    • Related Report
      2018 Research-status Report
  • [Int'l Joint Research] Los Alamos National Laboratory(米国)

    • Related Report
      2017 Research-status Report
  • [Journal Article] 115In NQR study with evidence for two magnetic quantum critical points in dual Ce site superconductor Ce3PtIn112020

    • Author(s)
      S. Kambe, H. Sakai, Y. Tokunaga, R. E. Walstedt, M. Kratochvilova, K. Uhlirova, and J. Custers
    • Journal Title

      Physical Review B

      Volume: 101 Issue: 8 Pages: 081103-081103

    • DOI

      10.1103/physrevb.101.081103

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] 重い電子系超伝導体CeCoIn5におけるZnおよびNi置換効果のNMR2020

    • Author(s)
      酒井 宏典、徳永 陽、芳賀 芳範、神戸 振作、F. Ronning、J.-X. Zhu、S. K. Ramakrishna、A. P. Reyes、小手川 恒、藤 秀樹、鈴木 康平、大島 佳樹、横山 淳
    • Organizer
      日本物理学会 第75回年次大会
    • Related Report
      2019 Annual Research Report
  • [Presentation] NQR/NMR study on Zn-doped CeCoIn52018

    • Author(s)
      H. Sakai, T. Hattori, Y. Tokunaga, S. Kambe, F. Ronning, J.-X. Zhu, K. Suzuki, Y. Oshima, and M. Yokoyama
    • Organizer
      12 PRAGUE COLLOQUIUM ON f-ELECTRON SYSTEMS (PCFES12-2018)
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] Zn置換CeCoIn5におけるNQR/NMR研究2018

    • Author(s)
      酒井 宏典, 服部 泰佑, 徳永 陽, 神戸 振作 , Filip Ronning, Jianxin Zhu, 鈴木 康平, 大島 佳樹, 横山 淳
    • Organizer
      日本物理学会第73回年次大会(2018年)
    • Related Report
      2017 Research-status Report
  • [Presentation] Local Moments in the Heterogeneous Electronic State of Cd or Zn-Substituted CeCoIn5 --Around Kondo holes --2017

    • Author(s)
      Hironori Sakai
    • Organizer
      The International Workshop on Recent Progress in Superconductivity (IWRS 2017)
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research / Invited

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Published: 2017-04-28   Modified: 2022-02-21  

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