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Fluctuation of the orbital/charge degree of freedom and novel physical properties in strongly correlated electron systems

Research Project

Project/Area Number 19H01853
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 13030:Magnetism, superconductivity and strongly correlated systems-related
Research InstitutionWaseda University

Principal Investigator

Katsufuji Takuro  早稲田大学, 理工学術院, 教授 (00272386)

Co-Investigator(Kenkyū-buntansha) 奥田 哲治  鹿児島大学, 理工学域工学系, 准教授 (20347082)
溝川 貴司  早稲田大学, 理工学術院, 教授 (90251397)
Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥17,290,000 (Direct Cost: ¥13,300,000、Indirect Cost: ¥3,990,000)
Fiscal Year 2021: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2020: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2019: ¥8,970,000 (Direct Cost: ¥6,900,000、Indirect Cost: ¥2,070,000)
Keywords軌道自由度 / 揺らぎ / 核生成-核成長 / 一軸歪 / 光誘起現象 / 光誘起相転移 / 電荷自由度 / ゆらぎ / 強相関電子系
Outline of Research at the Start

強相関電子系における軌道や電荷自由度に関して、秩序状態ではなく「揺らぎ」がもたらす新奇な物理を実験的に明らかにする。このために、「研究に適した新奇物質の開発」と「目的のために最適な物性測定」を両輪として行い、「軌道/電荷揺らぎのもたらす新しい物理」を見出すことを目標とする。

Outline of Final Research Achievements

We have experimentally investigated novel properties of transition metal oxides caused by spatial and temporal fluctuations in the orbital degrees of freedom of d electrons. We found dynamics of phase transitions dominated by a nucleation-growth process in orbital-ordered V oxides. Also, we found that the orbital correlation can be controlled by the strain, which is an external field conjugate to the orbital degrees of freedom, by optical measurements under uniaxial strain. Furthermore, we found a characteristic selection rule in the melting of orbital ordering by the irradiation of a laser pulse.

Academic Significance and Societal Importance of the Research Achievements

電子間のクーロン相互作用の強い強相関電子系において、電荷、スピン、軌道といった電子の複数の自由度に基づくマルチファンクショナルなデバイスや、巨大な外場応答を用いたデバイスが期待されている。その中で、軌道/電荷自由度の静的な秩序だけでなく、動的・空間的な揺らぎの様子を明らかにすることによって、より進んだ機能を発現することが可能になる。

Report

(4 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Annual Research Report
  • 2019 Annual Research Report
  • Research Products

    (12 results)

All 2022 2021 2020 2019 Other

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

  • [Int'l Joint Research] ローマ大学(イタリア)

    • Related Report
      2019 Annual Research Report
  • [Journal Article] Selection rule for the photoinduced phase transition dominated by anisotropy of strain in Ti3O52022

    • Author(s)
      T. Saiki, T. Yoshida, K. Akimoto, D. Indo, M. Arizono, T. Okuda, and T. Katsufuji
    • Journal Title

      Phys. Rev. B

      Volume: 105 Issue: 7 Pages: 075134-075134

    • DOI

      10.1103/physrevb.105.075134

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Superstructures arising from V trimers with orbital ordering in BaV10O152021

    • Author(s)
      T. Kajita, H. Kuwahara, S. Mori, and T. Katsufuji
    • Journal Title

      Phys. Rev. Research

      Volume: 3 Issue: 3 Pages: 033046-033046

    • DOI

      10.1103/physrevresearch.3.033046

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Metal-insulator transition in Ba3-xSrxNb5O152021

    • Author(s)
      Y. Kondoh, R. Takei, T. Okuda, K. Ueno, Y. Katayama, T. Saiki, W. Sekino, T. Kajita, and T. Katsufuji
    • Journal Title

      Phys. Rev. B

      Volume: 104 Issue: 12 Pages: 125128-125128

    • DOI

      10.1103/physrevb.104.125128

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Orbital and magnetic ordering and domain-wall conduction in ferrimagnet La5Mo4O162021

    • Author(s)
      Katsufuji Takuro、Miyake Masayuki、Naka Makoto、Mochizuki Masahito、Kogo Sota、Kajita Tomomasa、Shimizu Yasuhiro、Itoh Masayuki、Hasegawa Takatoshi、Shimose Shunsuke、Noguchi Shunta、Saiki Takuo、Sato Takuro、Kagawa Fumitaka
    • Journal Title

      Physical Review Research

      Volume: 3 Issue: 1 Pages: 013105-013105

    • DOI

      10.1103/physrevresearch.3.013105

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Pump-probe Spectroscopy with Uniaxial Strain for BaV10O152021

    • Author(s)
      T. Saiki , K. Funahashi, T. Yamazaki, T. Kajita., and T. Katsufuji
    • Journal Title

      J. Phys. Soc. Jpn.

      Volume: 90 Issue: 2 Pages: 024704-024704

    • DOI

      10.7566/jpsj.90.024704

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Nucleation and growth of orbital ordering2020

    • Author(s)
      T Katsufuji, T Kajita, S Yano, Y Katayama, K Ueno
    • Journal Title

      Nature Communications

      Volume: 11 Issue: 1 Pages: 2324-2324

    • DOI

      10.1038/s41467-020-16004-2

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Change in the optical spectrum of BaV10O15 with applied uniaxial strain2020

    • Author(s)
      T. Saiki, S. Ohkubo, K. Funahashi, T. Yamazaki, T. Kajita, and T. Katsufuji
    • Journal Title

      Physical Review B

      Volume: 101 Issue: 12

    • DOI

      10.1103/physrevb.101.121111

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Nonlinear Behavior in the Electrical Resistance of Strongly Correlated Insulators2020

    • Author(s)
      Katsufuji Takuro、Ikeda Hiroaki、Ashizawa Misa、Oike Michiyo、Kajita Tomomasa
    • Journal Title

      Journal of the Physical Society of Japan

      Volume: 89 Issue: 4 Pages: 044702-044702

    • DOI

      10.7566/jpsj.89.044702

    • NAID

      210000158074

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Temperature-dependent evolution of Ti 3d spectral features at surface of BaxTi8O16+δ2019

    • Author(s)
      Dash S、Enomoto H、Kajita T、Ono K、Horiba K、Kobayashi M、Kumigashira H、Kandyba V、Giampietri A、Barinov A、Stramaglia F、Saini N. L、Katsufuji T、Mizokawa T.
    • Journal Title

      Physical Review B

      Volume: 100 Issue: 12 Pages: 125153-125153

    • DOI

      10.1103/physrevb.100.125153

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] Novel optical response in d 1 and d 2 multimer systems2021

    • Author(s)
      T. Katsufuji
    • Organizer
      日本物理学会2021年秋季大会
    • Related Report
      2021 Annual Research Report
    • Invited
  • [Presentation] Anomalous magnetism and possible domain-wall conduction in La5Mo4O162020

    • Author(s)
      T. Katsufuji
    • Organizer
      KTJ-Symposium 2020
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited

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Published: 2019-04-18   Modified: 2023-01-30  

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