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Magnetotransport properties of topological materials with nontrivial magnetic structure

Research Project

Project/Area Number 21K03454
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 InstitutionToho University

Principal Investigator

Suzuki Takehito  東邦大学, 理学部, 講師 (80564947)

Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2023: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000)
Fiscal Year 2022: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2021: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
Keywords磁性トポロジカル半金属 / 磁気抵抗効果 / ホール効果 / 単結晶育成 / 磁化プラトー / トポロジカル半金属 / 磁気輸送特性 / 磁性トポロジカル物質 / 非共線的磁気構造 / 輸送特性 / トポロジカル物質 / 磁性
Outline of Research at the Start

物質中で実現する非自明なトポロジーを有する電子状態において、電子に内在する電荷・スピン・軌道の自由度間の結合がどの様に発現するかは未だ明らかになっていない。本研究では、特に、スピンの自由度が特徴的な役割を果たす非自明な磁気秩序が電子状態の持つトポロジーに対しどの様な影響を与えるかについて、純良物質の合成と磁気輸送特性の測定を一貫して行う実験的手法の研究を通じて明らかにする。

Outline of Final Research Achievements

We investigated magnetotransport properties of rare-earth intermetallic compounds with a nontrivial magnetic ordering pattern and a topological electronic band structure, and observed that topological semimetals with magnetization plateaus show the enhanced resistivity upon plateau transitions, which originates from the enhancement of electron scattering due to the development of magnetic fluctuations. In addition, we found the anomaly in the Hall conductivity in the specific magnetization plateau state, that is due to the nontrivial topology inherent to the magnetic structure.

Academic Significance and Societal Importance of the Research Achievements

本研究で明らかになった磁気輸送特性は,これまでに磁性トポロジカル物質で精力的に研究されてきた磁気秩序に伴う時間反転対称性の破れ及び電子バンド構造の交換分裂の効果を越える新たな機構に起因する輸送応答であり,電子バンド構造が持つ非自明なトポロジーと電子相関効果の結合により生じる強相関トポロジーの物理分野を開拓・解明に向けた研究に資する結果であると期待される.また,外場により非自明なトポロジーを有する状態を制御できる機能性は,トポロジーを動作原理に持つ将来的な素子への応用が期待される.

Report

(4 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • Research Products

    (6 results)

All 2024 2023 2022 2021 Other

All Int'l Joint Research (1 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] マサチューセッツ工科大学(米国)

    • Related Report
      2023 Annual Research Report
  • [Journal Article] Three-dimensional flat bands in pyrochlore metal CaNi22023

    • Author(s)
      Wakefield J. P., Kang M., Neves P. M., Oh D., Fang S., McTigue R., Frank Z. S. Y., Lamichhane T. N., Chen A., Lee S., Park S., Park J., Jozwiak C., Bostwick A., Rotenberg E., Rajapitamahuni A., Vescovo E., McChesney J. L., Graf D., Palmstrom J. C., Suzuki T., Li M., Comin R., Checkelsky J. G.
    • Journal Title

      Nature

      Volume: 623 Issue: 7986 Pages: 301-306

    • DOI

      10.1038/s41586-023-06640-1

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] Transport properties of topological semimetal with magnetization plateau2024

    • Author(s)
      Takehito Suzuki
    • Organizer
      the 22nd Japan-Korea-Taiwan Symposium on Strongly correlated electron systems
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Singular angular magnetoresistance in a nodal semimetal2022

    • Author(s)
      Takehito Suzuki
    • Organizer
      Workshop on Innovative Nanoscale Devices and Systems 2022
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] 三方晶PtBi2における化学置換効果2022

    • Author(s)
      織田百合奈、井上悠、勝藤拓郎、鈴木健士
    • Organizer
      第9回ZAIKEN Festa
    • Related Report
      2022 Research-status Report
  • [Presentation] 三重縮退点を有するPtBi2における輸送特性2021

    • Author(s)
      服部央弥, 福原迅士郎, 赤星大介, 勝藤 拓郎, 鈴木 健士
    • Organizer
      日本物理学会
    • Related Report
      2021 Research-status Report

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Published: 2021-04-28   Modified: 2025-01-30  

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