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Signature of spin-triplet exciton condensations in LaCoO3 at ultrahigh magnetic fields up to 600 T

Author

Listed:
  • Akihiko Ikeda

    (University of Tokyo
    University of Electro-Communications)

  • Yasuhiro H. Matsuda

    (University of Tokyo)

  • Keisuke Sato

    (Ibaraki College)

  • Yuto Ishii

    (University of Tokyo)

  • Hironobu Sawabe

    (University of Tokyo)

  • Daisuke Nakamura

    (University of Tokyo
    RIKEN Center for Emergent Matter Science (CEMS))

  • Shojiro Takeyama

    (University of Tokyo)

  • Joji Nasu

    (Tohoku University
    PRESTO, Japan Science and Technology Agency)

Abstract

Bose-Einstein condensation of electron-hole pairs, exciton condensation, has been effortfully investigated since predicted 60 years ago. Irrefutable evidence has still been lacking due to experimental difficulties in verifying the condensation of the charge neutral and non-magnetic spin-singlet excitons. Whilst, condensation of spin-triplet excitons is a promising frontier because spin supercurrent and spin-Seebeck effects will be observable. A canonical cobaltite LaCoO3 under very high magnetic fields is a propitious candidate, yet to be verified. Here, we unveil the exotic phase diagram of LaCoO3 up to 600 T generated using the electromagnetic flux compression method and the state-of-the-art magnetostriction gauge. We found the continuous magnetostriction curves and a bending structure, which suggest the emergence of two distinct spin-triplet exciton condensates. By constructing a phenomenological model, we showed that quantum fluctuations of excitons are crucial for the field-induced successive transitions. The spin-triplet exciton condensation in a cobaltite, which is three-dimensional and thermally equilibrated, opens up a novel venue for spintronics technologies with spin-supercurrent such as a spin Josephson junction.

Suggested Citation

  • Akihiko Ikeda & Yasuhiro H. Matsuda & Keisuke Sato & Yuto Ishii & Hironobu Sawabe & Daisuke Nakamura & Shojiro Takeyama & Joji Nasu, 2023. "Signature of spin-triplet exciton condensations in LaCoO3 at ultrahigh magnetic fields up to 600 T," Nature Communications, Nature, vol. 14(1), pages 1-6, December.
    • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-37125-4
    DOI: 10.1038/s41467-023-37125-4
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    References listed on IDEAS

    as
    1. Y. F. Lu & H. Kono & T. I. Larkin & A. W. Rost & T. Takayama & A. V. Boris & B. Keimer & H. Takagi, 2017. "Zero-gap semiconductor to excitonic insulator transition in Ta2NiSe5," Nature Communications, Nature, vol. 8(1), pages 1-7, April.
    2. C. W. Lai & N. Y. Kim & S. Utsunomiya & G. Roumpos & H. Deng & M. D. Fraser & T. Byrnes & P. Recher & N. Kumada & T. Fujisawa & Y. Yamamoto, 2007. "Coherent zero-state and π-state in an exciton–polariton condensate array," Nature, Nature, vol. 450(7169), pages 529-532, November.
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