IMRAM

Institute of Multidisciplinary Research for Advanced Materials, Tohoku University

東北大学
多元物質科学研究所

LAST UPDATE 2021/05/02

  • 研究者氏名
    Researcher Name

    佐藤卓　Taku J SATO
    教授　Professor

  • 所属
    Professional Affiliation

    東北大学多元物質科学研究所
    Institute of Multidisciplinary Research for Advanced Materials, Tohoku University

    無機材料研究部門　スピン量子物性研究分野
    Division of Inorganic Material Research, Quantum Spin Physics

  • 研究キーワード
    Research Keywords

    中性子散乱
    量子磁性体
    遍歴磁性体
    非従来型超伝導体
    Neutron scattering
    Quantum magnets
    Itinerant electron magnetism
    Unconventional superconductivity
研究テーマ
Research Subject
中性子散乱を用いた固体中のスピンダイナミクス研究
Neutron scattering research on the spin dynamics in condensed matters

研究の背景 Background

固体中の電子はスピン自由度に起因する種々の興味深い巨視的現象を示します。このような現象は基礎物理学的観点からだけではなく磁性や超伝導として応用の観点からも重要です。中性子散乱は固体中電子のスピンの配列や運動を直接観測することのできる強力な実験手段です。我々は中性子散乱を用いて固体の低温での種々の量子現象の探索と解明を行っています。

Interesting macroscopic phenomena in condensed matters are attributed to spin degree of freedom of many-body correlated electrons. Those phenomena are of significant importance not only from the fundamental physics viewpoint, but also for the future device applications, such as magnetism and superconductivity. The neutron scattering is the powerful tool to directly investigate the spin arrangement and dynamics in condensed matters. We use neutron scattering as a primary tool to investigate low-temperature quantum phenomena of condensed matters.

研究の目標 Outcome

量子籠目格子反強磁性体に代表されるフラストレート磁性体における新奇な巨視的量子基底状態の発見、鉄系超伝導体における超伝導機構の解明、カイラル磁性体中のトポロジカルなスピン構造とそれに起因するスローダイナミクスの解明等が我々の目標です。

We are aiming at 1) finding the novel macroscopic quantum state in the frustrated quantum magnets, represented by the s=1/2 quantum kagome-lattice antiferromagnets, 2) understanding the pairing mechanism of the iron-based hightemperature superconductors, and 3) exploring the spin arrangement and slow dynamics of topological spin texture in the chiral magnets.

研究図Research Figure

Fig.1. (a) Crystal structure of the Rb2Cu3SnF12 quantum kagome latteice antiferromagnet. (b) Distorted kagome lattice structure of Cu [1]. Fig.2. Spin excitations in the Rb2Cu3SnF12. Triplet excitations from the singlet valence bond solid state was observed [1] Fig.3. Strongly quantum renormalized dispersion relation of the spin excitations in the Cs2Cu3SnF12 [2].

文献 / Publications

[1] Nature Phys., 12, 865 (2010); [2] J. Phys. Soc. Jpn., 83, 043701 (2014).

研究者HP