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Spin current as a probe for spin excitations in high temperature superconducting materials

Research Project

Project/Area Number 19K23414
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 InstitutionTohoku University

Principal Investigator

Lustikova Jana  東北大学, 先端スピントロニクス研究開発センター, 助教 (90847964)

Project Period (FY) 2019-08-30 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2020: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2019: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywords超伝導 / 銅酸化物 / 鉄系超伝導 / スピン流 / スピントロニクス / スピン注入 / 鉄系超伝導体 / スピントロ二クス
Outline of Research at the Start

高温超伝導現象は磁気秩序と密接な関係があり、その発現機構においてスピン(電子の磁気的性質)の励起が重要な役割を果たすと考えられている。そこで新規物性プローブとしてスピンの流れである「スピン流」に注目する。近年スピントロニクス分野において盛んに研究されてきた磁性体や金属中のスピン流現象から、スピン励起によって伝搬するスピン流の描像はかなり鮮明になってきている。高温超伝導物質のスピン流に対する応答を調べることによって、従来の実験手法に加え高温超伝導スピン励起について新しい情報を取得し、高温超伝導の機構解明への貢献を目指す。

Outline of Final Research Achievements

The role of spin excitations in the appearance of superconductivity in high-temperature superconductors has been long discussed. In this study, we aim to observe spin excitations in high-temperature superconducting materials by the injection of spin current. The samples are high-temperature cuprates and iron-based superconductors coated with a thin film of ferromagnetic metal. By applying microwaves to the ferromagnetic coating, spin current injected into the superconductor material is estimated from the magnetic damping constant. As a result, we observed a change in damping constant close to the superconducting transition temperature in cuprate materials and below the structural transition temperature in iron-based materials. We have considered the origin of this effect.

Academic Significance and Societal Importance of the Research Achievements

高温超伝導物質の中では、高温超伝導銅酸化物及び鉄系超伝導体の超伝導転移温度が最も高い。両者におけるスピン励起の超伝導状態との関係について共通点及び相違点を明らかにすることによって、超伝導転移温度の向上に向けた物質設計指針が得られると期待されている。本研究の学術的意味は高温超伝導物質のスピン物性プローブとしてスピン流に注目することにある。中性子散乱や核磁気共鳴など従来の実験手法とは異なるエネルギーや長さスケールをプローブし、高温超伝導体におけるスピン励起の多角的理解に貢献する。

Report

(3 results)
  • 2020 Annual Research Report   Final Research Report ( PDF )
  • 2019 Research-status Report

Research Products

(12 results)

All 2020 2019 Other

All Int'l Joint Research (4 results) Presentation (8 results) (of which Int'l Joint Research: 5 results,  Invited: 3 results)

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

    • Related Report
      2020 Annual Research Report
  • [Int'l Joint Research] Tsinghua University(中国)

    • Related Report
      2020 Annual Research Report
  • [Int'l Joint Research] Purdue University(米国)

    • Related Report
      2019 Research-status Report
  • [Int'l Joint Research] Tsinghua University(中国)

    • Related Report
      2019 Research-status Report
  • [Presentation] Transport phenomena in superconductor/magnet hybrids2020

    • Author(s)
      Jana Lustikova
    • Organizer
      Tohoku University - Riken 2nd collaborative workshop “Math meets Quantum Materials”
    • Related Report
      2020 Annual Research Report
    • Invited
  • [Presentation] Spin Transport and Excitations in MBE-grown Fe-based High Tc Superconductors2020

    • Author(s)
      Jana Lustikova
    • Organizer
      Tohoku-Tsinghua Joint Conference 2020 on Matching Fund Projects 2019 and 2020
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Spin valve devices with van der Waals superconductor materials2020

    • Author(s)
      Jana Lustikova
    • Organizer
      The 4th International Symposium for The Core Research Cluster for Spintronics
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 磁性絶縁体|超伝導量子渦系における非相反電気応答2019

    • Author(s)
      Jana Lustikova
    • Organizer
      第27回渦糸物理ワークショップ
    • Related Report
      2019 Research-status Report
    • Invited
  • [Presentation] Spin-dependent transport phenomena in superconducting materials2019

    • Author(s)
      Jana Lustikova
    • Organizer
      The 3rd Symposium for The Core Research Clusters for Materials Science and Spintronics
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Vortex rectenna powered by environmental fluctuations2019

    • Author(s)
      Jana Lustikova
    • Organizer
      AIMR Workshop on Quantum Materials and Spintronics: Spin, Topology and Superconductivity
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Oscillatory Nernst effect in Pt|ferrite|cuprate-superconductor trilayer films2019

    • Author(s)
      Jana Lustikova
    • Organizer
      東北大金研-CROSSワークショップ「J-PARCとJRR-3の相補利用による偏極中性子科学の新展開」
    • Related Report
      2019 Research-status Report
  • [Presentation] Rectification effects in a superconducting vortex liquid with magnet proximity2019

    • Author(s)
      Jana Lustikova
    • Organizer
      PQSEI/Birck Nanotechnology Center/Spintronics Seminar
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research / Invited

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Published: 2019-09-03   Modified: 2022-01-27  

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