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2021 Fiscal Year Final Research Report

Microscopic investigation of ferromagnetic superconductivity under uniaxial stress

Research Project

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Project/Area Number 19K03726
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 InstitutionJapan Atomic Energy Agency

Principal Investigator

Tokunaga Yo  国立研究開発法人日本原子力研究開発機構, 原子力科学研究部門 原子力科学研究所 先端基礎研究センター, 研究主幹 (00354902)

Co-Investigator(Kenkyū-buntansha) 青木 大  東北大学, 金属材料研究所, 教授 (30359541)
Project Period (FY) 2019-04-01 – 2022-03-31
Keywordsスピン三重項超伝導 / ウラン系強磁性超伝導体 / 核磁気共鳴
Outline of Final Research Achievements

We have investigated the mechanism of spin-triplet superconductivity on uranium-based ferromagnetic superconductors using NMR techniques. We have prepared 73Ge-enriched single crystal of URhGe, and performed 73Ge-NMR measurement under uniaxial stress. The experiment have revealed successive changes of internal field, electronic field gradient, and magnetic spin fluctuations with applying uniaxial stress. Furthermore, we have conducted NMR experiments on a newly-discovered uranium-based superconductor UTe2, and detected the development of extremely slow electronic fluctuations in the normal state of UTe2.

Free Research Field

固体物理

Academic Significance and Societal Importance of the Research Achievements

スピン三重項超伝導は, トポロジカル超伝導がバルクで実現する系として, 次世代の量子コンピュータへの応用が強く期待されている. 本研究を通じて, スピン三重項超伝導を示すウラン系強磁性超伝導体の磁気揺らぎの性質について, その共通点と物質ごとの個性が明らかになった. これらの情報は, 今後スピン三重項超伝導の理論モデルを構築する上でも, 極めて重要である. また今回, 希釈冷凍機温度で一軸圧下でのNMR測定に成功したことで, NMR研究の可能性がさらに拡がった.

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Published: 2023-01-30  

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