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

Ellen Fogh (), Mithilesh Nayak (), Oleksandr Prokhnenko, Maciej Bartkowiak, Koji Munakata, Jian-Rui Soh, Alexandra A. Turrini, Mohamed E. Zayed, Ekaterina Pomjakushina, Hiroshi Kageyama, Hiroyuki Nojiri, Kazuhisa Kakurai, Bruce Normand, Frédéric Mila and Henrik M. Rønnow
Additional contact information
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
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)
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)
Frédéric Mila: Ecole Polytechnique Fédérale de Lausanne (EPFL)
Henrik M. Rønnow: Ecole Polytechnique Fédérale de Lausanne (EPFL)

Nature Communications, 2024, vol. 15, issue 1, 1-10

Abstract: 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.

Date: 2024
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DOI: 10.1038/s41467-023-44115-z

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