| Autor: |
Werner, J., Neef, C., Koo, C., Ponomaryov, A., Zvyagin, S., Klingeler, R. |
| Rok vydání: |
2021 |
| Předmět: |
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| Zdroj: |
Phys. Rev. B 103, 174406 (2021) |
| Druh dokumentu: |
Working Paper |
| DOI: |
10.1103/PhysRevB.103.174406 |
| Popis: |
Low-energy magnon excitations in magnetoelectric LiFePO$_4$ have been investigated by high-frequency high-field electron spin resonance spectroscopy in magnetic fields up to B = 58 T and frequencies up to f = 745 GHz. For magnetic fields applied along the easy magnetic axis, the excitation gap softens and vanishes at the spin-flop field of BSF = 32 T before hardening again at higher fields. In addition, for B smaller than BSF we observe a resonance mode assigned to excitations due to Dzyaloshinskii-Moriya (DM)-interactions, thereby evidencing sizable DM interaction of approx 150 micro eV in LiFePO4. Both the magnetisation and the excitations up to high magnetic fields are described in terms of a mean-field theory model which extends recent zero field inelastic neutron scattering results. Our results imply that magnetic interactions as well as magnetic anisotropy have a sizable quadratic field dependence which we attribute to significant magnetostriction. |
| Databáze: |
arXiv |
| Externí odkaz: |
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