| Title: |
Spin waves and three-dimensionality in the high-pressure antiferromagnetic phase of SrCu$_2$(BO$_3$)$_2$ |
| Authors: |
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. |
| Source: |
Phys. Rev. Lett. 133, 246702 (2024) |
| Publication Year: |
2024 |
| Collection: |
Condensed Matter |
| Subject Terms: |
Condensed Matter - Strongly Correlated Electrons |
| More Details: |
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.
Comment: Main text + supplemental material |
| Document Type: |
Working Paper |
| DOI: |
10.1103/PhysRevLett.133.246702 |
| Access URL: |
http://arxiv.org/abs/2406.17546 |
| Accession Number: |
edsarx.2406.17546 |
| Database: |
arXiv |
