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Unraveling the spin state of magnetic ionic liquids

Research Project

Project/Area Number 17K05619
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Biological physics/Chemical physics/Soft matter physics
Research InstitutionJapan Atomic Energy Agency

Principal Investigator

Kofu Maiko  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 J-PARCセンター, 研究副主幹 (70549568)

Project Period (FY) 2017-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2019: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2018: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2017: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Keywordsスピングラス / 磁性イオン液体 / 中性子散乱 / 局所磁気励起 / 物性実験 / イオン液体 / 磁性
Outline of Final Research Achievements

Magnetic ionic liquids with magnetic anion exist in liquid state near room temperature. One remarkable feature is that either crystalline or glassy state can be created depending on thermal history. At low temperatures, antiferromagnetic ordering occurs in the crystal state while a spin glass transition in the structural glass state. Inelastic neutron scattering measurements have demonstrated that spin-wave excitations were observed in in the ordered phase of the crystalline sample, while localized low-energy magnetic excitations in the spin glass state. The localized excitation is scaled by the Bose population factor below the spin glass transition temperature and has a lot in common with low-energy vibrations (boson peak) commonly observed in structural glasses. The “magnetic” boson peak could be described by elementary excitations arising from spin clusters with different sizes and spin configurations.

Academic Significance and Societal Importance of the Research Achievements

スピングラスは様々な物質群において発現し、その特異な緩和ダイナミクスが詳細に調べられてきた。一方、スピングラス固有の磁気励起は存在するかという基本的問いに対し、明確な解答は得られていない。結晶上で発現するスピングラスでは、隣接する秩序相由来のスピン波などが現れてしまうことが一因である。本研究では、構造ガラス上で発現するスピングラスに着目し、局所磁気励起が存在することを明らかにした。この局所磁気励起は、結晶状態のスピン波とは全く異なり、スピングラス状態に固有のものである。局所磁気励起を示唆する理論計算の報告もあり、今後スピングラス状態における素励起の理解が進むと期待される。

Report

(4 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Research-status Report
  • 2017 Research-status Report
  • Research Products

    (13 results)

All 2020 2019 2018 2017 Other

All Journal Article (3 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 3 results) Presentation (9 results) (of which Int'l Joint Research: 5 results,  Invited: 4 results) Remarks (1 results)

  • [Journal Article] Dynamics of Atomic Hydrogen in Palladium Probed by Neutron Spectroscopy2020

    • Author(s)
      Kofu Maiko、Yamamuro Osamu
    • Journal Title

      Journal of the Physical Society of Japan

      Volume: 89 Issue: 5 Pages: 051002-051002

    • DOI

      10.7566/jpsj.89.051002

    • NAID

      210000158066

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Two inherent crossovers of the diffusion process in glass-forming liquids2018

    • Author(s)
      Kofu Maiko、Faraone Antonio、Tyagi Madhusudan、Nagao Michihiro、Yamamuro Osamu
    • Journal Title

      Physical Review E

      Volume: 98 Issue: 4 Pages: 042601-042601

    • DOI

      10.1103/physreve.98.042601

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Neutron scattering studies on short- and long-range layer structures and related dynamics in imidazolium-based ionic liquids2018

    • Author(s)
      Nemoto Fumiya、Kofu Maiko、Nagao Michihiro、Ohishi Kazuki、Takata Shin-ichi、Suzuki Jun-ichi、Yamada Takeshi、Shibata Kaoru、Ueki Takeshi、Kitazawa Yuzo、Watanabe Masayoshi、Yamamuro Osamu
    • Journal Title

      The Journal of Chemical Physics

      Volume: 149 Issue: 5 Pages: 054502-054502

    • DOI

      10.1063/1.5037217

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] 磁性イオン液体C4mimFeCl4の構造ガラス上で発現するスピングラス状態2019

    • Author(s)
      古府麻衣子、綿貫竜太、榊原俊郎、河村聖子、中島健次、上木岳士、阿久津和宏、山室修
    • Organizer
      日本物理学会
    • Related Report
      2019 Annual Research Report
  • [Presentation] Neutron scattering study of a magnetic ionic liquid C4mimFeCl42019

    • Author(s)
      M. Kofu, R. Watanuki, T. Sakakibara, S. Ohira-Kawamura, K. Nakajima, T. Ueki, K. Akutsu, O. Yamamuro
    • Organizer
      3rd J-PARC Symposium
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Spin glass on a structural glass of a magnetic ionic liquid2019

    • Author(s)
      Maiko Kofu, Ryuta Watanuki, Toshiro Sakakibara, Seiko Ohira-Kawamura, Kenji Nakajima, Takeshi Ueki, Kazuhiro Akutsu, Osamu Yamamuro
    • Organizer
      The 3rd Asia-Oceania Conference on Neutron Scattering 2019
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Spin glass dynamics in a structural glass of C4mimFeCl42019

    • Author(s)
      Maiko Kofu, Ryuta Watanuki, Toshiro Sakakibara, Seiko Ohira-Kawamura, Kenji Nakajima, Takeshi Ueki, Kazuhiro Akutsu, Osamu Yamamuro
    • Organizer
      Materials Research Meeting 2019
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Dynamics of atomic hydrogen in bulk and nanocrystalline palladium2018

    • Author(s)
      Maiko Kofu, Naoki Hashimoto, Hiroshi Akiba, Hirokazu Kobayashi,Hiroshi Kitagawa, Madhusudan Tyagi, Antonio Faraone, John Copley, Wiebke Lohstroh, Kazuki Iida, Mitsutaka Nakamura, Osamu Yamamuro
    • Organizer
      QENS/WINS2018
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] ナノ粒子パラジウム中の水素原子のダイナミクス2018

    • Author(s)
      古府麻衣子、橋本直樹、秋葉宙、小林浩和、北川宏、飯田一樹、中村充孝、Madhusudan Tyagi、Antonio Faraone、John Copley、Wiebke Lohstroh、山室修
    • Organizer
      日本中性子科学会
    • Related Report
      2018 Research-status Report
    • Invited
  • [Presentation] 単分子磁石Zn-Ln-Zn三核錯体の中性子散乱研究2018

    • Author(s)
      古府麻衣子、梶原孝志、河村聖子、菊地龍弥、中島健次、松浦直人、柴田薫、長尾道弘、山室修
    • Organizer
      日本物理学会
    • Related Report
      2018 Research-status Report
  • [Presentation] 中性子散乱で観るイオン液体と分子液体のダイナミクス2018

    • Author(s)
      古府 麻衣子
    • Organizer
      日本物理学会領域6シンポジウム
    • Related Report
      2017 Research-status Report
    • Invited
  • [Presentation] Spatial scale dependence of structural relaxation in glass-forming liquids2017

    • Author(s)
      Maiko Kofu, Antonio Faraone, Madhusudan Tyagi, Michihiro Nagao, Osamu Yamamuro
    • Organizer
      International Conference on Neutron Scattering
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Remarks] 古府麻衣子researchmapウェブページ

    • URL

      https://researchmap.jp/kofu125/

    • Related Report
      2019 Annual Research Report 2018 Research-status Report 2017 Research-status Report

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Published: 2017-04-28   Modified: 2021-02-19  

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