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Investigation of Bose-Einstein condensation of triplet exciton in cobaltites

Research Project

Project/Area Number 18K13493
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 13030:Magnetism, superconductivity and strongly correlated systems-related
Research InstitutionThe University of Tokyo

Principal Investigator

Ikeda Akihiko  東京大学, 物性研究所, 助教 (90707663)

Project Period (FY) 2018-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2019: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2018: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Keywordsコバルト酸化物 / 励起子凝縮 / 強相関 / 強磁場 / 磁歪 / ファイバーブラッググレーティング / 電磁濃縮法 / 三重項励起子凝縮 / スピンクロスオーバー / 超強磁場 / スピン状態自由度 / ボーズアインシュタイン凝縮
Outline of Final Research Achievements

We have carried out a study to clarify the origin of the high-magnetic field induced phases of LaCoO3. It has been found that there are two novel phases up above 100 T region. The candidate for the novel phases are the crystallizations of spin-state degree of freedom (SSC: Spin-state crystal) and the Bose-Einstein condensation of spin-state degree of freedom (EC: Excitonic condensation). We have developed a magnetostriction measurement system for up above 100 T region utilizing the fiber Bragg grating strain gauge and implementing a very high-speed 100 Mhz detection system.
We carried out a series of magnetostriction measurement of LaCoO3. We observed magnetostriction plateaux for both of the two novel phases. We concluded that the two novel phases are both originating in SSCs rather than EC.

Academic Significance and Societal Importance of the Research Achievements

遍歴・局在の二重性を有する強相関酸化物において特異な電子磁気物性を解明することは、将来の量子デバイスの材料開拓にもつながる。本課題では遷移金属酸化物でも理解の遅れているコバルト酸化物に着目し、そのスピン状態自由度を磁場でコントロールすることでその物性解明、新奇状態の実現を目的とした。非自明であった強磁場相ではスピン状態が磁気的に局在的な相であることを見いだした。電子的には遍歴的であると考えられている物質で、磁気的に局在的な相が存在することは興味深く、非従来的な材料であることが明らかになった。

Report

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

    (8 results)

All 2020 2019 2018

All Journal Article (8 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 7 results,  Open Access: 1 results)

  • [Journal Article] Direct measurement of resistivity in destructive pulsed magnetic fields2020

    • Author(s)
      Kohama Yoshimitsu、Nabeshima Fuyuki、Maeda Atsutaka、Ikeda Akihiko、Matsuda Yasuhiro H.
    • Journal Title

      Review of Scientific Instruments

      Volume: 91 Issue: 3 Pages: 033901-033901

    • DOI

      10.1063/1.5127773

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] High magnetic field x-ray diffraction study of the α phase of solid oxygen: Absence of giant magnetostriction2019

    • Author(s)
      Matsuda Yasuhiro H.、Shimizu Ayumi、Ikeda Akihiko、Nomura Toshihiro、Yajima Takeshi、Inami Toshiya、Takahashi Kohki、Kobayashi Tatsuo C.
    • Journal Title

      Physical Review B

      Volume: 100 Issue: 21 Pages: 214105-214105

    • DOI

      10.1103/physrevb.100.214105

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Magnetoelastic couplings in the deformed kagome quantum spin lattice of volborthite2019

    • Author(s)
      Ikeda Akihiko、Furukawa Shunsuke、Janson Oleg、Matsuda Yasuhiro H.、Takeyama Shojiro、Yajima Takeshi、Hiroi Zenji、Ishikawa Hajime
    • Journal Title

      Physical Review B

      Volume: 99 Issue: 14 Pages: 140412-140412

    • DOI

      10.1103/physrevb.99.140412

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Journal Article] Shrinking a Coin Using Pulsed High Magnetic Fields2018

    • Author(s)
      池田 暁彦、松田 康弘
    • Journal Title

      Butsuri

      Volume: 73 Issue: 5 Pages: 318-320

    • DOI

      10.11316/butsuri.73.5_318

    • NAID

      130007590597

    • ISSN
      0029-0181, 2423-8872
    • Year and Date
      2018-05-05
    • Related Report
      2018 Research-status Report
  • [Journal Article] Magnetic-Field-Induced Kondo Metal Realized in YbB122018

    • Author(s)
      Terashima Taku T.、Matsuda Yasuhiro H.、Kohama Yoshimitsu、Ikeda Akihiko、Kondo Akihiro、Kindo Koichi、Iga Fumitoshi
    • Journal Title

      Physical Review Letters

      Volume: 120 Issue: 25 Pages: 257206-257206

    • DOI

      10.1103/physrevlett.120.257206

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Note: Optical filter method for high-resolution magnetostriction measurement using fiber Bragg grating under millisecond-pulsed high magnetic fields at cryogenic temperatures2018

    • Author(s)
      Ikeda Akihiko、Matsuda Yasuhiro H.、Tsuda Hiroshi
    • Journal Title

      Review of Scientific Instruments

      Volume: 89 Issue: 9 Pages: 096103-096103

    • DOI

      10.1063/1.5034035

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Journal Article] Record indoor magnetic field of 1200 T generated by electromagnetic flux-compression2018

    • Author(s)
      Nakamura D.、Ikeda A.、Sawabe H.、Matsuda Y. H.、Takeyama S.
    • Journal Title

      Review of Scientific Instruments

      Volume: 89 Issue: 9 Pages: 095106-095106

    • DOI

      10.1063/1.5044557

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Journal Article] 100 MHz high-speed strain monitor using fiber Bragg grating and optical filter applied for magnetostriction measurements of cobaltite at magnetic fields beyond 100 T2018

    • Author(s)
      Ikeda Akihiko、Nomura Toshihiro、Matsuda Yasuhiro H.、Tani Shuntaro、Kobayashi Yohei、Watanabe Hiroshi、Sato Keisuke
    • Journal Title

      Physica B: Condensed Matter

      Volume: 536 Pages: 847-849

    • DOI

      10.1016/j.physb.2017.09.017

    • Related Report
      2018 Research-status Report
    • Peer Reviewed

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Published: 2018-04-23   Modified: 2021-02-19  

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