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Double dome structure of the Bose–Einstein condensation in diluted S = 3/2 quantum magnets

Author

Listed:
  • Yoshito Watanabe

    (The University of Tokyo)

  • Atsushi Miyake

    (The University of Tokyo)

  • Masaki Gen

    (The University of Tokyo)

  • Yuta Mizukami

    (The University of Tokyo)

  • Kenichiro Hashimoto

    (The University of Tokyo)

  • Takasada Shibauchi

    (The University of Tokyo)

  • Akihiko Ikeda

    (University of Electro-Communications)

  • Masashi Tokunaga

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

  • Takashi Kurumaji

    (The University of Tokyo)

  • Yusuke Tokunaga

    (The University of Tokyo)

  • Taka-hisa Arima

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

Abstract

Bose–Einstein condensation (BEC) in quantum magnets, where bosonic spin excitations condense into ordered ground states, is a realization of BEC in a thermodynamic limit. Although previous magnetic BEC studies have focused on magnets with small spins of S ≤ 1, larger spin systems potentially possess richer physics because of the multiple excitations on a single site level. Here, we show the evolution of the magnetic phase diagram of S = 3/2 quantum magnet Ba2CoGe2O7 when the averaged interaction J is controlled by a dilution of magnetic sites. By partial substitution of Co with nonmagnetic Zn, the magnetic order dome transforms into a double dome structure, which can be explained by three kinds of magnetic BECs with distinct excitations. Furthermore, we show the importance of the randomness effects induced by the quenched disorder: we discuss the relevance of geometrical percolation and Bose/Mott glass physics near the BEC quantum critical point.

Suggested Citation

  • Yoshito Watanabe & Atsushi Miyake & Masaki Gen & Yuta Mizukami & Kenichiro Hashimoto & Takasada Shibauchi & Akihiko Ikeda & Masashi Tokunaga & Takashi Kurumaji & Yusuke Tokunaga & Taka-hisa Arima, 2023. "Double dome structure of the Bose–Einstein condensation in diluted S = 3/2 quantum magnets," Nature Communications, Nature, vol. 14(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-36725-4
    DOI: 10.1038/s41467-023-36725-4
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