Spin wave Hamiltonian and anomalous scattering in NiPS$_3$
| Autor: | Scheie, A., Park, Pyeongjae, Villanova, J. W., Granroth, G. E., Sarkis, C. L., Zhang, Hao, Stone, M. B., Park, Je-Geun, Okamoto, S., Berlijn, T., Tennant, D. A. |
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| Rok vydání: | 2023 |
| Předmět: | |
| Zdroj: | Phys. Rev. B 108, 104402 (2023) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevB.108.104402 |
| Popis: | We report a comprehensive spin wave analysis of the semiconducting honeycomb van der Waal antiferromagnet NiPS$_3$. Using single crystal inelastic neutron scattering, we map out the full Brillouin zone and fit the observed modes to a spin wave model with rigorously defined uncertainty. We find that the third neighbor exchange $J_3$ dominates the Hamiltonian, a feature which we fully account for by ab-initio density functional theory calculations. We also quantify the degree to which the three-fold rotation symmetry is broken and account for the $Q=0$ excitations observed in other measurements, yielding a spin exchange model which is consistent across multiple experimental probes. We also identify a strongly reduced static ordered moment and reduced low-energy intensity relative to the linear spin wave calculations, signaling unexplained features in the magnetism which requires going beyond the linear spin wave approximation. Comment: 7 pages, 8 figures; 8 pages and 10 additional figures of appendices |
| Databáze: | arXiv |
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