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  4. Exceptional field dependence of antiferromagnetic magnons in LiFePO4
 
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2021
Journal Article
Title

Exceptional field dependence of antiferromagnetic magnons in LiFePO4

Abstract
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 ≈150meV 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.
Author(s)
Werner, Johannes
Heidelberg Univ., Kirchhoff Institute of Physics
Neef, Christoph  orcid-logo
Fraunhofer-Institut für System- und Innovationsforschung ISI  
Koo, Changhyun
Heidelberg Univ., Kirchhoff Institute of Physics
Ponomaryov, Alexey
Helmholtz-Zentrum Dresden Rossendorf, HLD-EMFL
Zvyagin, Sergei
Helmholtz-Zentrum Dresden Rossendorf, HLD-EMFL
Klingeler, Rüdiger
Heidelberg Univ., Kirchhoff Institute of Physics; CAM Heidelberg
Journal
Physical Review. B  
Open Access
File(s)
Download (619.4 KB)
DOI
10.24406/publica-r-267536
10.1103/PhysRevB.103.174406
Language
English
Fraunhofer-Institut für System- und Innovationsforschung ISI  
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