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Exceptional field dependence of antiferromagnetic magnons in LiFePO4

: Werner, Johannes; Neef, Christoph; Koo, Changhyun; Ponomaryov, Alexey; Zvyagin, Sergei; Klingeler, Rüdiger

Preprint urn:nbn:de:0011-n-6352611 (619 KByte PDF)
MD5 Fingerprint: 6d4558b3a3275a7c8e6d5dd645d07dc5
Erstellt am: 2.6.2021

Physical Review. B 103 (2021), Nr.17, Art. 174406, 10 S.
ISSN: 0163-1829
ISSN: 1098-0121
ISSN: 0556-2805
ISSN: 2469-9950
ISSN: 2469-9969
Zeitschriftenaufsatz, Elektronische Publikation
Fraunhofer ISI ()

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.