Spin waves and three-dimensionality in the high-pressure antiferromagnetic phase of SrCu$_2$(BO$_3$)$_2$
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| Main Authors: | , , , , , , , , , , , , , |
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| Format: | Preprint |
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2024
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| author | Fogh, E. Giriat, G. Zayed, M. E. Piovano, A. Boehm, M. Steffens, P. Safiulina, I. Hansen, U. B. Klotz, S. Soh, J. -R. Pomjakushina, E. Mila, F. Normand, B. Rønnow, H. M. |
| author_facet | Fogh, E. Giriat, G. Zayed, M. E. Piovano, A. Boehm, M. Steffens, P. Safiulina, I. Hansen, U. B. Klotz, S. Soh, J. -R. Pomjakushina, E. Mila, F. Normand, B. Rønnow, H. M. |
| contents | Quantum magnetic materials can provide explicit realizations of paradigm models in quantum many-body physics. In this context, SrCu$_2$(BO$_3$)$_2$ is a faithful realization of the Shastry-Sutherland model (SSM) for ideally frustrated spin dimers, even displaying several of its quantum magnetic phases as a function of pressure. We perform inelastic neutron scattering (INS) measurements on SrCu$_2$(BO$_3$)$_2$ at 5.5 GPa and 4.5 K, observing spin waves that characterize the high-pressure antiferromagnetic phase. The experimental spectra are well described by linear spin-wave calculations on a SSM with an inter-layer interaction, which is determined accurately as $J_c = 0.053(3)$ meV. The presence of $J_c$ indicates the need to account for the three-dimensional nature of SrCu$_2$(BO$_3$)$_2$ in theoretical models, also at lower pressures. We find that the ratio between in-plane interactions, $J'/J = 1.8(2)$, undergoes a dramatic change compared to lower pressures that we deduce is driven by a sharp drop in the dimer coupling, $J$. Our results underline the wide horizons opened by high-pressure INS experiments on quantum magnetic materials. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2406_17546 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Spin waves and three-dimensionality in the high-pressure antiferromagnetic phase of SrCu$_2$(BO$_3$)$_2$ Fogh, E. Giriat, G. Zayed, M. E. Piovano, A. Boehm, M. Steffens, P. Safiulina, I. Hansen, U. B. Klotz, S. Soh, J. -R. Pomjakushina, E. Mila, F. Normand, B. Rønnow, H. M. Strongly Correlated Electrons Quantum magnetic materials can provide explicit realizations of paradigm models in quantum many-body physics. In this context, SrCu$_2$(BO$_3$)$_2$ is a faithful realization of the Shastry-Sutherland model (SSM) for ideally frustrated spin dimers, even displaying several of its quantum magnetic phases as a function of pressure. We perform inelastic neutron scattering (INS) measurements on SrCu$_2$(BO$_3$)$_2$ at 5.5 GPa and 4.5 K, observing spin waves that characterize the high-pressure antiferromagnetic phase. The experimental spectra are well described by linear spin-wave calculations on a SSM with an inter-layer interaction, which is determined accurately as $J_c = 0.053(3)$ meV. The presence of $J_c$ indicates the need to account for the three-dimensional nature of SrCu$_2$(BO$_3$)$_2$ in theoretical models, also at lower pressures. We find that the ratio between in-plane interactions, $J'/J = 1.8(2)$, undergoes a dramatic change compared to lower pressures that we deduce is driven by a sharp drop in the dimer coupling, $J$. Our results underline the wide horizons opened by high-pressure INS experiments on quantum magnetic materials. |
| title | Spin waves and three-dimensionality in the high-pressure antiferromagnetic phase of SrCu$_2$(BO$_3$)$_2$ |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2406.17546 |