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Construction of soft x-ray electronic structure station and elucidation of electronic structure of topological superconductors

Research Project

Project/Area Number 23K25128
Project/Area Number (Other) 22H03874 (2022-2023)
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeMulti-year Fund (2024)
Single-year Grants (2022-2023)
Section一般
Review Section Basic Section 80040:Quantum beam science-related
Research InstitutionJapan Atomic Energy Agency

Principal Investigator

Fujimori Shin-ichi  国立研究開発法人日本原子力研究開発機構, 原子力科学研究所 物質科学研究センター, 研究主幹 (70343936)

Project Period (FY) 2024-04-01 – 2025-03-31
Project Status Completed (Fiscal Year 2024)
Budget Amount *help
¥15,990,000 (Direct Cost: ¥12,300,000、Indirect Cost: ¥3,690,000)
Fiscal Year 2024: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Fiscal Year 2023: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Fiscal Year 2022: ¥10,790,000 (Direct Cost: ¥8,300,000、Indirect Cost: ¥2,490,000)
Keywords超伝導 / 電子構造 / 光電子分光 / 放射光 / 強相関電子系 / 光電子分光法
Outline of Research at the Start

超伝導は物性物理学において最も顕著で魅力的な巨視的量子物理現象の一つであるが、特にスピン三重項超伝導体は、トポロジカル超伝導体の候補として注目を集めている。その中でも、2018年末にスピン三重項超伝導体であることが発見されたUTe2は量子ビットとしての応用可能性が見いだされている。本研究課題では、大型放射光施設SPring-8軟X線ビームラインBL23SUにおいて、その詳細な電子構造を直接観測可能な「軟X線電子構造解析ステーション」を構築し、UTe2の電子状態を世界で初めて明らかにすることによって、その超伝導発現機構の解明に繋げることを目指す。

Outline of Final Research Achievements

In this study, we enhanced the photoelectron spectroscopy system at SPring-8 BL23SU to improve energy resolution and applied soft X-ray angle-resolved photoemission spectroscopy (SX-ARPES) to f-electron superconductors such as UTe2. We successfully revealed the detailed electronic structure and Fermi surface of UTe2, obtaining key insights into its superconducting pairing symmetry. Additionally, we investigated the electronic states of other f-electron superconductors, including UPt3 and CeIr3, providing fundamental data to advance the understanding of superconductivity mechanisms in f-electron systems.

Academic Significance and Societal Importance of the Research Achievements

超伝導は物性物理学において最も顕著で魅力的な物性物理現象の一つであるが、特にUTe2はその超伝導の特殊な対称性や、高品位単結晶が得られることから、量子コンピュータにおける量子ビットとしての応用が期待されるなど、現在非常に注目を集めている。本研究課題ではこの超伝導メカニズムの理解に向けて実験的に重要な知見を提供し、その理論的基礎となるものである。さらに様々なf電子系超伝導体の電子状態を明らかにすることによって、その特殊性と一般性を明らかにした。これらの成果は、将来的な新物質開発や高性能材料の創出に繋がる基盤となるものである。

Report

(4 results)
  • 2024 Annual Research Report   Final Research Report ( PDF )
  • 2023 Annual Research Report
  • 2022 Annual Research Report
  • Research Products

    (10 results)

All 2024 2023 2022 Other

All Int'l Joint Research (2 results) Journal Article (5 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 5 results) Presentation (3 results) (of which Int'l Joint Research: 3 results,  Invited: 3 results)

  • [Int'l Joint Research] Max Planck Institute(ドイツ)

    • Related Report
      2023 Annual Research Report
  • [Int'l Joint Research] Mizoram University(インド)

    • Related Report
      2023 Annual Research Report
  • [Journal Article] Impact of theCe4f states in the electronic structure of the intermediate-valence superconductor CeIr32023

    • Author(s)
      Fujimori Shin-ichi、Kawasaki Ikuto、Takeda Yukiharu、Yamagami Hiroshi、Sasabe Norimasa、Sato Yoshiki J、Nakamura Ai、Shimizu Yusei、Maurya Arvind、Homma Yoshiya、Li Dexin、Honda Fuminori、Aoki Dai
    • Journal Title

      Electronic Structure

      Volume: 5 Issue: 4 Pages: 045009-045009

    • DOI

      10.1088/2516-1075/ad0a3d

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Strongly renormalized quasiparticles in UPt32023

    • Author(s)
      Ikuto Kawasaki, Kazuharu Takeuchi, Shin-ichi Fujimori, Yukiharu Takeda, Hiroshi Yamagami, Etsuji Yamamoto and Yoshinori Haga
    • Journal Title

      Phys. Rev. B

      Volume: 108 Issue: 16 Pages: 165127-165127

    • DOI

      10.1103/physrevb.108.165127

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Effect of Mn substitution on the electronic structure for Mn-doped indium-tin oxide films studied by soft and hard x-ray photoemission spectroscopy2023

    • Author(s)
      Ootsuki Daiki、Ishida Tatsuhiro、Tsutsumi Naoya、Kobayashi Masaki、Inagaki Kohdai、Yoshida Teppei、Takeda Yukiharu、Fujimori Shin-ichi、Yasui Akira、Kitagawa Saiki、Nakamura Toshihiro
    • Journal Title

      Physical Review Materials

      Volume: 7 Issue: 12 Pages: 124601-124601

    • DOI

      10.1103/physrevmaterials.7.124601

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Role of on-site Coulomb interactions in the half-metallic Weyl ferromagnet candidate thin-film Co2FeSi2023

    • Author(s)
      Sumida Kazuki、Fujita Yuichi、Zhou Weinan、Masuda Keisuke、Kawasaki Ikuto、Fujimori Shin-ichi、Kimura Akio、Sakuraba Yuya
    • Journal Title

      Physical Review B

      Volume: 108 Issue: 24

    • DOI

      10.1103/physrevb.108.l241101

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Quasiparticle State in 4f Localized Ferromagnet CeRu2Ge2 Studied by Soft X-ray Photoemission Spectroscopy2023

    • Author(s)
      Kawasaki Ikuto、Fujimori Shin-ichi、Takeda Yukiharu、Yamagami Hiroshi、?nuki Yoshichika
    • Journal Title

      Journal of the Physical Society of Japan

      Volume: 92 Issue: 6 Pages: 064709-064709

    • DOI

      10.7566/jpsj.92.064709

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Presentation] Electronic Structures of f-Electron Superconductors2024

    • Author(s)
      Shin-ichi Fujimori
    • Organizer
      AVS 70 international symposium
    • Related Report
      2024 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Electronic structure of UTe2: a perspective from photoelectron spectroscopy2023

    • Author(s)
      Shin-ichi Fujimori
    • Organizer
      Asia-Pacific Conference on Condensed Matter Physics 2023
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Electronic structure of UTe2: Perspectives from photoelectron spectroscopy2022

    • Author(s)
      Shin-ichi Fujimori
    • Organizer
      International Workshop on the Dual Nature of f-Electrons 2022
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research / Invited

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Published: 2022-04-19   Modified: 2026-01-16  

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