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High magnetic field investigations of the magnetic properties and moleclar orbitals in the compounds with tantalum 5d electrons

Research Project

Project/Area Number 19K23420
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 InstitutionThe University of Tokyo

Principal Investigator

Ishikawa Hajime  東京大学, 物性研究所, 助教 (70843192)

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)
Keywords5d電子物性 / 強磁場物性 / 新物質開発 / 量子物質 / 磁性 / スピン軌道相互作用 / 超強磁場 / 物質探索
Outline of Research at the Start

本研究は5d遷移金属元素の一つであるタンタルの電子自由度を、非常に強い磁場を用いて制御し、磁場により引き起こされる相転移を探索すること目的とする。対象物質の純良な試料を合成し、パルス超強磁場中での物性測定を行うことにより、多極子と呼ばれるd電子の磁性と電荷分布が強く結合した自由度や分子軌道状態を大きく変化させるような未知の磁場誘起相転移の観測を目指す。

Outline of Final Research Achievements

In the convectional magnets, the magnetic properties carried by spins and electric properties carried by orbitals of electrons are often separated. In recent condensed matter physics, physical properties of new type of magnets, where the spins and orbitals are strongly coupled, are investigated intensively. We aim to discover novel magnetism and uncover the magnetic properties of spin-orbital coupled magnets by the synthesis of new materials and physical properties measurements in strong pulsed magnetic field.
We discovered novel magnetic phenomena such as the phase transition into the robust nonmagnetic ground state, changes of the effect of the spin-orbit coupling depending on the type of halogen ions, and the magnetic field induced phase transition.

Academic Significance and Societal Importance of the Research Achievements

近年の物性物理分野における中心的な研究課題の一つであるスピン軌道相互作用の強い磁性体を対象に、新物質の合成と超強磁場下での物性測定を組み合わせた独自のアプローチによって未知の磁気現象を発見しました。
本研究の成果は、電子機器や磁性材料の動作原理の基盤である物性物理、磁性、物質科学といった学問分野における最先端の知見を与え、当該分野の発展に寄与することが期待されます。

Report

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

    (9 results)

All 2021 2020 2019

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

  • [Journal Article] Ligand dependent magnetism of the Jeff = 3/2 Mott insulator Cs2MX6 (M = Ta, Nb, X = Br, Cl)2021

    • Author(s)
      Hajime Ishikawa, Takeshi Yajima, Akira Matsuo, Koichi Kindo
    • Journal Title

      Journal of Physics: Condensed Matter

      Volume: 33 Issue: 12 Pages: 1258021-6

    • DOI

      10.1088/1361-648x/abd7b5

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Nonmagnetic Ground States and a Possible Quadrupolar Phase in 4d and 5d Lacunar Spinel Selenides GaM4Se8 (M=Nb, Ta)2020

    • Author(s)
      Ishikawa Hajime、Yajima Takeshi、Matsuo Akira、Ihara Yoshihiko、Kindo Koichi
    • Journal Title

      Physical Review Letters

      Volume: 124 Issue: 22 Pages: 2272021-6

    • DOI

      10.1103/physrevlett.124.227202

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Kitaev Spin Liquid Candidate OsxCl3 Comprised of Honeycomb Nano-Domains2020

    • Author(s)
      Kota Kataoka, Daigoro Hirai, Takeshi Yajima, Daisuke Nishio-Hamane, Rieko Ishii, Kwang-Yong Choi, Dirk Wulferding, Peter Lemmens, Shunichiro Kittaka, Toshiro Sakakibara, Hajime Ishikawa, Akira Matsuo, Koichi Kindo, and Zenji Hiroi
    • Journal Title

      Journal of the Physical Society of Japan

      Volume: 89 Issue: 11 Pages: 1147091-9

    • DOI

      10.7566/jpsj.89.114709

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Nonmagnetic ground states and a possible quadrupolar phase in 4d and 5d lacunar spinel selenides GaM4Se8 (M = Nb,Ta)2020

    • Author(s)
      Hajime Ishikawa, Takeshi Yajima, Akira Matsuo, Yoshihiko Ihara, Koichi Kindo
    • Journal Title

      Physical Review Letters

      Volume: -

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Presentation] 4d1,5d1イオンを有する磁性体Cs2MX6(M=Nb,Ta,X=F,Cl,Br)におけるJeff=3/2状態の形成と磁性2021

    • Author(s)
      石川孟, 矢島健, 松尾晶, 金道浩一
    • Organizer
      日本物理学会第76回年次大会
    • Related Report
      2020 Annual Research Report
  • [Presentation] LacunarSpinel型4d,5d電子系GaM4Se8(M=Nb,Ta)の構造と磁性2020

    • Author(s)
      石川孟, 矢島健, 松尾晶, 井原慶彦, 金道浩一
    • Organizer
      日本物理学会2020年秋季大会
    • Related Report
      2020 Annual Research Report
  • [Presentation] Novel Magnetic Phases of Spin-orbit Coupled d1 Electron Systems Explored by Materials Development and Strong Magnetic Field2020

    • Author(s)
      Hajime Ishikawa
    • Organizer
      ARHMF2020 & KINKEN Materials Science School 2020 for Young Scientists
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] スピン軌道相互作用の強いd1電子系の磁性2019

    • Author(s)
      石川孟、松尾晶、金道浩一
    • Organizer
      強磁場科学研究会
    • Related Report
      2019 Research-status Report
  • [Presentation] 5d1タンタル塩化物の電子状態と多極子秩序2019

    • Author(s)
      石川孟,、高山知弘、 Reinhard Kremer、Jurgen Nuss、Robert Dinnebier、北川健太郎、石井賢司、高木英典
    • Organizer
      日本物理学会秋季大会
    • Related Report
      2019 Research-status Report

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

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