Field-induced bound-state condensation and spin-nematic phase in SrCu<sub>2</sub>(BO<sub>3</sub>)<sub>2</sub> revealed by neutron scattering up to 25.9 T
<p dir="ltr">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 SrCu<sub>2</sub>(BO<sub>3</sub>)<sub>2</s...
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| مؤلفون آخرون: | , , , , , , , , , , , , , |
| منشور في: |
2024
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| الملخص: | <p dir="ltr">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 SrCu<sub>2</sub>(BO<sub>3</sub>)<sub>2</sub>, 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 SrCu<sub>2</sub>(BO<sub>3</sub>)<sub>2</sub> 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 <i>S</i> = 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 SrCu<sub>2</sub>(BO<sub>3</sub>)<sub>2</sub> is best understood as a condensate of bosonic Cooper pairs.</p><h2 dir="ltr">Other Information</h2><p dir="ltr">Published in: Nature Communications<br>License: <a href="https://creativecommons.org/licenses/by/4.0" target="_blank">https://creativecommons.org/licenses/by/4.0</a><br>See article on publisher's website: <a href="https://dx.doi.org/10.1038/s41467-023-44115-z" target="_blank">https://dx.doi.org/10.1038/s41467-023-44115-z</a></p> |
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