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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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Main Authors: Werner, Johannes (Author) , Neef, Christoph (Author) , Koo, Changhyun (Author) , Ponomaryov, Alexey N. (Author) , Zvyagin, Sergei (Author) , Klingeler, Rüdiger (Author)
Format: Article (Journal)
Language:English
Published: 5 May 2021
In: Physical review
Year: 2021, Volume: 103, Issue: 17, Pages: 1-7
ISSN:2469-9969
DOI:10.1103/PhysRevB.103.174406
Online Access: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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Author Notes:J. Werner, C. Neef, C. Koo, A. Ponomaryov, S. Zvyagin, and R. Klingele
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Summary: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.
Item Description:Im Titel die "4" ist tiefgestellt
Gesehen am 09.06.2021
Physical Description:Online Resource
ISSN:2469-9969
DOI:10.1103/PhysRevB.103.174406

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