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Novel thermoelectric transport properties in chiral magnetic metals

Research Project

Project/Area Number 22K20360
Research Category

Grant-in-Aid for Research Activity Start-up

Allocation TypeMulti-year Fund
Review Section 0202:Condensed matter physics, plasma science, nuclear engineering, earth resources engineering, energy engineering, and related fields
Research InstitutionTokyo University of Science

Principal Investigator

Sato Yoshiki  東京理科大学, 創域理工学部先端物理学科, 助教 (30962550)

Project Period (FY) 2022-08-31 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2023: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2022: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywordsキラル化合物 / 熱電物質 / フェルミ面 / 横熱電変換 / 単結晶育成 / 物質開発 / キラリティ / 熱電能 / 電子輸送特性 / 熱電効果
Outline of Research at the Start

本研究は、キラルな結晶構造を持つ希土類磁性体を対象とし、熱電能や電気伝導度といった輸送特性の精密な測定を通して、結晶構造のキラリティと結びついた磁性・結晶構造の対称性に保護されたトポロジカルな電子状態に起因する特異な輸送現象の開拓や、その理解を目指すものである。希土類磁性体の系統的な物質開発・精密測定や遷移金属磁性体との比較を通して、特異な輸送現象の系統的な理解を目指す。

Outline of Final Research Achievements

The present study focuses on the peculiar magnetism and energy band structure in materials with chiral crystal structures, as well as the electronic transport phenomena arising from them. We reported the discovery of a new material GdPt2B and succeeded in growing single crystals of GdPt2B. In addition, we observed an anomalous Hall effect, which occurs by a non-trivial mechanism in GdPt2B, which exhibits characteristic magnetism due to the chirality of the crystal. Interesting results were also obtained in non-magnetic chiral crystals, such as the topology of the Fermi surface and characteristic thermoelectric transport phenomena in NbGe2 with strong electron-phonon interactions, and the axis-dependent conduction polarity in the chiral metal LaPt2B due to the mixed-dimensionality of the Fermi surfaces.

Academic Significance and Societal Importance of the Research Achievements

持続可能な社会の実現のため、省エネルギーなメモリデバイスや、高効率な廃エネルギーの利用を可能にする熱電素子など、新しい機能性材料にかかる期待は大きい。キラル結晶は上述したような材料を探索する上で非常に有望なプラットフォームであり、また同時に、基礎学理を探求する上でも興味深い物質群である。本研究で報告した新しいキラル化合物や、そこで観測された異常な輸送現象や熱電変換は、基礎・応用の両方の観点から興味深い研究成果である。

Report

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

    (11 results)

All 2023 2022

All Journal Article (5 results) (of which Peer Reviewed: 5 results,  Open Access: 2 results) Presentation (6 results) (of which Int'l Joint Research: 2 results)

  • [Journal Article] Fermi surface topology and electronic transport properties of chiral crystal NbGe2 with strong electron-phonon interaction2023

    • Author(s)
      Sato Yoshiki J., Nakamura Ai, Nishinakayama Rei, Okazaki Ryuji, Harima Hisatomo, Aoki Dai
    • Journal Title

      Physical Review B

      Volume: 108 Issue: 23 Pages: 235115-235115

    • DOI

      10.1103/physrevb.108.235115

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Monoaxial Dzyaloshinskii-Moriya interaction-induced topological Hall effect in a new chiral-lattice magnet GdPt2B2023

    • Author(s)
      Sato Yoshiki J.、Manako Hikari、Okazaki Ryuji、Yasui Yukio、Nakamura Ai、Aoki Dai
    • Journal Title

      Physical Review B

      Volume: 107 Issue: 21 Pages: 214420-214420

    • DOI

      10.1103/physrevb.107.214420

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Carrier filtering effect for enhanced thermopower in a body-centered tetragonal ruthenate2023

    • Author(s)
      Otsuki Ryota、Sato Yoshiki J.、Okazaki Ryuji、Komine Tomoya、Kurihara Ryosuke、Yaguchi Hiroshi
    • Journal Title

      Physical Review Materials

      Volume: 7 Issue: 12

    • DOI

      10.1103/physrevmaterials.7.125401

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Mechanically exfoliated low-layered [Ca2CoO3]0.62[CoO2]: A single-crystalline p-type transparent conducting oxide2023

    • Author(s)
      Okada Reiji、Isomura Hiroto、Sato Yoshiki J.、Okazaki Ryuji、Inoue Masayuki、Yoshioka Shinya
    • Journal Title

      Applied Physics Letters

      Volume: 123 Issue: 5

    • DOI

      10.1063/5.0162677

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] New Gd-based magnetic compound GdPt2B with a chiral crystal structure2022

    • Author(s)
      Sato Yoshiki J.、Manako Hikari、Homma Yoshiya、Li Dexin、Okazaki Ryuji、Aoki Dai
    • Journal Title

      Physical Review Materials

      Volume: 6 Issue: 10 Pages: 1044121-8

    • DOI

      10.1103/physrevmaterials.6.104412

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] Magnetic properties and Hall effect in a new chiral-lattice magnet GdPt2B2023

    • Author(s)
      Y. J. Sato, H. Manako, R. Okazaki, A. Nakamura, D. Aoki, Y. Yasui
    • Organizer
      International Conference on Strongly Correlated Electron Systems 2023
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Orthogonal thermoelectricity in a multi-dimensional goniopolar conductor LaPt2B2023

    • Author(s)
      Y. J. Sato, H. Manako, S. Ohsumi, R. Okazaki, D. Aoki
    • Organizer
      ISSP Regular Workshop: How high can we raise thermoelectric performance?
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 一軸らせん結晶GdPt2Bにおけるトポロジカルホール効果2023

    • Author(s)
      佐藤芳樹, 眞子日佳里, 岡崎竜二, 安井幸夫, 仲村愛, 青木大
    • Organizer
      日本物理学会 第78回年次大会
    • Related Report
      2023 Annual Research Report
  • [Presentation] キラルな結晶構造を有するNbGe2における強い電子格子相互作用とフェルミオロジー2023

    • Author(s)
      佐藤芳樹, 仲村愛, 西中山怜, 岡崎竜二, 播磨尚朝, 青木大
    • Organizer
      日本物理学会 2023年春季大会
    • Related Report
      2023 Annual Research Report
  • [Presentation] キラルな結晶構造を有するNbGe2における強い電子格子相互作用とフェルミオロジー2023

    • Author(s)
      佐藤 芳樹, 仲村 愛, 西中山 怜, 岡崎 竜二, 播磨 尚朝, 青木 大
    • Organizer
      日本物理学会 2023年春季大会
    • Related Report
      2022 Research-status Report
  • [Presentation] キラルな結晶構造を有する希土類磁性体の新物質GdPt2B2022

    • Author(s)
      佐藤 芳樹, 眞子 日佳里, 本間 佳哉, 李 徳新, 岡崎 竜二, 青木 大
    • Organizer
      日本物理学会 2022年秋季大会
    • Related Report
      2022 Research-status Report

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Published: 2022-09-01   Modified: 2025-01-30  

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