Transverse and longitudinal magnons in strongly anisotropic antiferromagnet FePSe3
arxiv(2024)
摘要
FePSe3 is a collinear honeycomb antiferromagnet with an easy-axis anisotropy
and large spins S=2. It belongs to a family of magnetic van der Waals
materials, which recently attracted a considerable attention. In this work we
present an experimental magneto-optical study of the low-energy excitation
spectrum in FePSe3, together with its theoretical description. The observed
response contains several types of magnon excitations. Two of them are
conventional transverse magnons described by a classical theory of
antiferromagnetic resonance. Two other modes are identified as multimagnon
hexadecapole excitations with an anomalous g factor approximately equal to four
times the g factor of a single Fe^2+ ion. These quasiparticles correspond to
full reversals of iron spins that coherently propagate in the up-down
antiferromagnetic structure. They constitute a novel type of collective
excitations in anisotropic magnetic solids, called longitudinal magnons.
Comparison between theory and experiment allows us to estimate the microscopic
parameters of FePSe3 including exchange coupling constants and the single-ion
anisotropy.
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