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Development and investigation of kagome metal materials with unconventional magnetotransport properties

Research Project

Project/Area Number 22K13996
Research Category

Grant-in-Aid for Early-Career Scientists

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

Principal Investigator

Ishikawa Hajime  東京大学, 物性研究所, 助教 (70843192)

Project Period (FY) 2022-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2023: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2022: ¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
Keywordsカゴメ格子金属 / ハニカム格子金属 / 磁性 / 超伝導 / パルス強磁場 / カゴメ金属 / 単結晶育成 / ハニカム金属 / カゴメ格子 / 磁気抵抗測定 / 新物質開発 / バンド構造 / 磁気輸送測定 / 結晶育成
Outline of Research at the Start

固体中の電子の動きは電子のバンド構造を強く反映する。多くの物質が放物線状のバンドを有するのに対し、カゴメ格子とよばれる二次元格子に原子が並ぶと、線形なバンドや平坦なバンドが現れ、磁場に対して一般的な金属とは大きく異なる応答を示すと期待されている。本研究は、新物質開発とバンド構造を強く反映する強い磁場領域までの磁気輸送特性の測定から、カゴメ格子をもつ金属に特有な輸送特性を開拓する。

Outline of Final Research Achievements

Metallic materials with two-dimensional kagome or honeycomb lattices are expected to exhibit linear dispersion or flat region in the electronic band structure and show electronic properties that are significantly different from those of ordinary metals, however, such examples are limited.
In this study, we have investigated the physical properties of a 3d transition metal kagome system YxFe6Sn6 and revealed that it is a material where the spin, lattice, and the conduction electrons of iron are strongly coupled.
We also discovered a new superconductor La2IOs2, which has a honeycomb lattice of the 5d transition metal osmium. We have proposed it is a new material that exhibits a competition between the electronic phase transition and superconductivity

Academic Significance and Societal Importance of the Research Achievements

二次元のカゴメ格子やハニカム格子を持つ金属では、格子の対称性に起因して一般的な金属とは大きく異なる性質を示すと考えられています。本研究では、遷移金属のカゴメ格子やハニカム格子をもつ新しい物質を合成して性質を明らかにし、磁性と電気伝導性の強い結びつきや、超伝導といった特異な電子物性を観測しました。以上の成果は、物性物理分野の中心的な課題の一つである、電子自由度の秩序と電気伝導性の相関に関する研究に新たな舞台を提示しました。

Report

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

    (6 results)

All 2024 2023 Other

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

  • [Int'l Joint Research] Rice University(米国)

    • Related Report
      2023 Annual Research Report
  • [Journal Article] Magnetic anisotropy of CeCoSi under high magnetic field2024

    • Author(s)
      Tomoki Kanda, Hajime Ishikawa, Shusaku Imajo, Koichi Kindo, Hiroshi Tanida , Yoshimitsu Kohama
    • Journal Title

      Physical Review B

      Volume: -

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Superconductivity at 12 K in La2IOs2: A 5d metal with osmium honeycomb layer2023

    • Author(s)
      Hajime Ishikawa, Takeshi Yajima, Daisuke Nishio-Hamane, Shusaku Imajo, Koichi Kindo, Mitsuaki Kawamura
    • Journal Title

      Physical Review Materials

      Volume: 7 Issue: 5 Pages: 054804-054804

    • DOI

      10.1103/physrevmaterials.7.054804

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Fermi surface and light quasi particles in hourglass nodal chain metal β-ReO22023

    • Author(s)
      Daigorou Hirai, Takahito Anbai, Takako Konoike, Shinya Uji, Yuya Hattori, Taichi Terashima, Hajime Ishikawa, Koichi Kindo, Naoyuki Katayama, Tamio Oguchi, Zenji Hiroi
    • Journal Title

      Journal of Physics: Condensed Matter

      Volume: 35 Issue: 40 Pages: 405503-405503

    • DOI

      10.1088/1361-648x/ace22c

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Presentation] アニオン遷移金属ハニカム層を有するLa2IOs2における12 Kでの超伝導2023

    • Author(s)
      石川孟
    • Organizer
      第33回日本MRS年次大会
    • Related Report
      2023 Annual Research Report
    • Invited
  • [Presentation] 5dアニオン遷移金属ハニカム格子をもつLa2IOs2におけるTc = 12 Kの超伝導2023

    • Author(s)
      石川孟
    • Organizer
      日本物理学会 第78回年次大会
    • Related Report
      2023 Annual Research Report

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Published: 2022-04-19   Modified: 2025-01-30  

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