Exceptional field dependence of antiferromagnetic magnons in LiFePO4
Low-energy magnon excitations in magnetoelectric LiFePO4 have been investigated by high-frequency-high-field electron spin resonance spectroscopy in magnetic fields up to B=58T and frequencies up to f=745GHz. For magnetic fields applied along the easy magnetic axis, the excitation gap softens and va...
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| Hauptverfasser: | , , , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
5 May 2021
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| In: |
Physical review
Year: 2021, Jahrgang: 103, Heft: 17, Pages: 1-7 |
| ISSN: | 2469-9969 |
| DOI: | 10.1103/PhysRevB.103.174406 |
| Online-Zugang: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1103/PhysRevB.103.174406 Verlag, lizenzpflichtig, Volltext: https://link.aps.org/doi/10.1103/PhysRevB.103.174406 
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| Verfasserangaben: | J. Werner, C. Neef, C. Koo, A. Ponomaryov, S. Zvyagin, and R. Klingele |
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| 520 | |a Low-energy magnon excitations in magnetoelectric LiFePO4 have been investigated by high-frequency-high-field electron spin resonance spectroscopy in magnetic fields up to B=58T and frequencies up to f=745GHz. For magnetic fields applied along the easy magnetic axis, the excitation gap softens and vanishes at the spin-flop field of BSF=32T before hardening again at higher fields. In addition, for B≲BSF we observe a resonance mode assigned to excitations due to Dzyaloshinskii-Moriya (DM) interactions, thereby evidencing a sizable DM interaction of ≈150μeV in LiFePO4. Both the magnetization 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. | ||
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