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Field-induced bound-state condensation and spin-nematic phase in SrCu2(BO3)2 revealed by neutron scattering up to 25.9 T

Author

Listed:
  • Ellen Fogh

    (Ecole Polytechnique Fédérale de Lausanne (EPFL))

  • Mithilesh Nayak

    (Ecole Polytechnique Fédérale de Lausanne (EPFL))

  • Oleksandr Prokhnenko

    (Helmholtz-Zentrum Berlin für Materialien und Energie)

  • Maciej Bartkowiak

    (Helmholtz-Zentrum Berlin für Materialien und Energie
    Rutherford Appleton Laboratory)

  • Koji Munakata

    (Comprehensive Research Organization for Science and Society (CROSS))

  • Jian-Rui Soh

    (Ecole Polytechnique Fédérale de Lausanne (EPFL))

  • Alexandra A. Turrini

    (Ecole Polytechnique Fédérale de Lausanne (EPFL)
    Paul Scherrer Institute)

  • Mohamed E. Zayed

    (Carnegie Mellon University in Qatar)

  • Ekaterina Pomjakushina

    (Paul Scherrer Institute)

  • Hiroshi Kageyama

    (Kyoto University)

  • Hiroyuki Nojiri

    (Tohoku University)

  • Kazuhisa Kakurai

    (Comprehensive Research Organization for Science and Society (CROSS))

  • Bruce Normand

    (Ecole Polytechnique Fédérale de Lausanne (EPFL)
    Paul Scherrer Institute)

  • Frédéric Mila

    (Ecole Polytechnique Fédérale de Lausanne (EPFL))

  • Henrik M. Rønnow

    (Ecole Polytechnique Fédérale de Lausanne (EPFL))

Abstract

In quantum magnetic materials, ordered phases induced by an applied magnetic field can be described as the Bose-Einstein condensation (BEC) of magnon excitations. In the strongly frustrated system SrCu2(BO3)2, no clear magnon BEC could be observed, pointing to an alternative mechanism, but the high fields required to probe this physics have remained a barrier to detailed investigation. Here we exploit the first purpose-built high-field neutron scattering facility to measure the spin excitations of SrCu2(BO3)2 up to 25.9 T and use cylinder matrix-product-states (MPS) calculations to reproduce the experimental spectra with high accuracy. Multiple unconventional features point to a condensation of S = 2 bound states into a spin-nematic phase, including the gradients of the one-magnon branches and the persistence of a one-magnon spin gap. This gap reflects a direct analogy with superconductivity, suggesting that the spin-nematic phase in SrCu2(BO3)2 is best understood as a condensate of bosonic Cooper pairs.

Suggested Citation

  • Ellen Fogh & Mithilesh Nayak & Oleksandr Prokhnenko & Maciej Bartkowiak & Koji Munakata & Jian-Rui Soh & Alexandra A. Turrini & Mohamed E. Zayed & Ekaterina Pomjakushina & Hiroshi Kageyama & Hiroyuki , 2024. "Field-induced bound-state condensation and spin-nematic phase in SrCu2(BO3)2 revealed by neutron scattering up to 25.9 T," Nature Communications, Nature, vol. 15(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-023-44115-z
    DOI: 10.1038/s41467-023-44115-z
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    References listed on IDEAS

    as
    1. S. O. Demokritov & V. E. Demidov & O. Dzyapko & G. A. Melkov & A. A. Serga & B. Hillebrands & A. N. Slavin, 2006. "Bose–Einstein condensation of quasi-equilibrium magnons at room temperature under pumping," Nature, Nature, vol. 443(7110), pages 430-433, September.
    2. Zhenzhong Shi & Sachith Dissanayake & Philippe Corboz & William Steinhardt & David Graf & D. M. Silevitch & Hanna A. Dabkowska & T. F. Rosenbaum & Frédéric Mila & Sara Haravifard, 2022. "Discovery of quantum phases in the Shastry-Sutherland compound SrCu2(BO3)2 under extreme conditions of field and pressure," Nature Communications, Nature, vol. 13(1), pages 1-9, December.
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