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High-pressure reearch for magnetically mediated superconductivity in alpha-Mn

Research Project

Project/Area Number 18K03517
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 13030:Magnetism, superconductivity and strongly correlated systems-related
Research InstitutionOkayama University

Principal Investigator

Kobayashi Tatsuo  岡山大学, 自然科学研究科, 教授 (80205468)

Project Period (FY) 2018-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2020: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2019: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2018: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Keywordsマンガン / 高圧 / 異常ホール効果 / 磁性 / 超伝導探索 / 量子臨界現象 / Mn / 弱強磁性 / 超伝導 / 磁気ゆらぎ
Outline of Final Research Achievements

The pressure-temperature phase diagram of alpha-Mn is established. The weak ferromagnetic (WFM) phase is discovered under high pressure, where a huge anomalous Hall effect (AHE) is observed. The AHE emerging due to the change of the ordered state is the first case, indicating that the origin is the Berry curvature in the ordered state with irreducible representation same as the ferromagnet. At the critical pressure where the WFM phase disappears, the electrical resistance shows T^5/3 dependence in the wide temperature range, indicating the existence of the ferromagnetic fluctuation. The superconductivity has not been observed in the pressure range up to 17 GPa. The ferromagnetic fluctuation in the noncentrosymmetric metal causes the lack of the band degeneracy which is required in the formation of Cooper pairs.

Academic Significance and Societal Importance of the Research Achievements

α-Mnは単体金属であるが,高圧物性がほとんど明らかになっていない。本研究では純良単結晶の作成に成功し,その高圧物性を明らかにした。Mnは他の高温相を含め,反強磁性体として知られており,わずか1.4 GPaの圧力で弱い強磁性を示すことは驚きであった。異常ホール効果の起源については近年理解が進み,電子が感じるベリー位相と関係があることが提案されてきたが,α-Mnで発見された秩序構造の変化により現れる異常ホール効果はこれを直接的に示しており,学術的意義は大きい。ホール効果は応用にも重要であり,社会的意義も大きいと言える。期待された超伝導は観測されなかったが、その理由も明らかになった。

Report

(4 results)
  • 2020 Annual Research Report   Final Research Report ( PDF )
  • 2019 Research-status Report
  • 2018 Research-status Report
  • Research Products

    (10 results)

All 2020 2019

All Journal Article (3 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 3 results,  Open Access: 2 results) Presentation (7 results) (of which Int'l Joint Research: 1 results)

  • [Journal Article] Anomalous Hall effect triggered by pressure-induced magnetic phase transition in α-Mn2020

    • Author(s)
      K. Akiba, K. Iwamoto, T. Sato, S. Araki, T. C. Kobayashi
    • Journal Title

      Phys. Rev. Research

      Volume: 2 Issue: 4

    • DOI

      10.1103/physrevresearch.2.043090

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Pressure-Temperature Phase Diagram of α-Mn2020

    • Author(s)
      Sato Takaaki、Akiba Kazuto、Araki Shingo、Kobayashi Tatsuo C.
    • Journal Title

      JPS Conf. Proc.

      Volume: 30 Pages: 011030-011030

    • DOI

      10.7566/jpscp.30.011030

    • NAID

      130008152152

    • Related Report
      2020 Annual Research Report 2019 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Helimagnetic Structure and Heavy-Fermion-Like Behavior in the Vicinity of the Quantum Critical Point in Mn3P2020

    • Author(s)
      Kotegawa Hisashi、Matsuda Masaaki、Ye Feng、Tani Yuki、Uda Kohei、Kuwata Yoshiki、Tou Hideki、Matsuoka Eiichi、Sugawara Hitoshi、Sakurai Takahiro、Ohta Hitoshi、Harima Hisatomo、Takeda Keiki、Hayashi Junichi、Araki Shingo、Kobayashi Tatsuo C.
    • Journal Title

      Physical Review Letters

      Volume: 124 Issue: 8 Pages: 1-6

    • DOI

      10.1103/physrevlett.124.087202

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] α-Mnの圧力誘起相の磁性2020

    • Author(s)
      佐藤飛諒, 秋葉和人, 荒木新吾, 小林達生
    • Organizer
      日本物理学会第75回年次大会
    • Related Report
      2020 Annual Research Report
  • [Presentation] NMRによるヘリカル磁性体Mn3Pの研究2020

    • Author(s)
      谷悠希, 小手川恒, 宇田幸平, 桑田祥希, 藤秀樹, 菅原仁, 播磨尚朝, 荒木新吾, 小林達生, 武田圭生, 櫻井敬博, 太田仁, Feng Ye, 松田雅昌
    • Organizer
      日本物理学会第75回年次大会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 高圧下αMnのNMR測定IV2020

    • Author(s)
      伊藤知晃, 片岡祐熙, 塩田直輝, 深澤英人, 小堀洋, 小林達生
    • Organizer
      日本物理学会2020年秋季大会
    • Related Report
      2020 Annual Research Report
  • [Presentation] α-Mnの圧力誘起磁性相における異常Hall効果2020

    • Author(s)
      秋葉和人, 岩本凱成, 佐藤飛諒, 荒木新吾, 小林達生
    • Organizer
      日本物理学会2020年秋季大会
    • Related Report
      2020 Annual Research Report
  • [Presentation] α-Mnの高圧物性2020

    • Author(s)
      小林達生
    • Organizer
      JPhysics+イン淡路
    • Related Report
      2020 Annual Research Report
  • [Presentation] Pressure-temperature phase diagram of α-Mn2019

    • Author(s)
      T. Sato
    • Organizer
      SCES2019
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] α-Mnの温度-圧力相図2019

    • Author(s)
      佐藤飛諒
    • Organizer
      日本物理学会2019年秋季大会
    • Related Report
      2019 Research-status Report

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Published: 2018-04-23   Modified: 2022-01-27  

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