Renormalization of spin excitations in hexagonal HoMnO3 by magnon-phonon coupling

Abstract

Hexagonal HoMnO3, a two-dimensional Heisenberg antiferromagnet, has been studied via inelastic neutron scattering. A simple Heisenberg model with a single-ion anisotropy describes most features of the spin-wave dispersion curves. However, there is shown to be a renormalization of the magnon energies located at around 11 meV. Since both the magnon-magnon interaction and magnon-phonon coupling can affect the renormalization in a noncollinear magnet, we have accounted for both of these couplings by using a Heisenberg XXZ model with 1=S expansions [1] and the Einstein site phonon model [13], respectively. This quantitative analysis leads to the conclusion that the renormalization effect primarily originates from the magnon-phonon coupling, while the spontaneous magnon decay due to the magnon-magnon interaction is suppressed by strong two-ion anisotropy.

arXiv comment5 pages, 4 figures

References in corpus (14)

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Cited by in corpus (9)

• Topological Magnetoelastic Excitations in Non-Collinear Antiferromagnets
• Evidence for magnon-phonon coupling in the topological magnet Cu${}_3$TeO${}_6$
• Magnon-polaron excitations in the noncollinear antiferromagnet Mn${}_3$Ge
• Hybridization and Decay of Magnetic Excitations in two-dimensional Triangular Lattice Antiferromagnets
• Spin-orbit coupling effects on spin-phonon coupling in Cd2Os2O7
• Interplay between spin dynamics and crystal field in multiferroic compound HoMnO${}_3$
• Exchange striction induced thermal Hall effect in van der Waals antiferromagnet MnPS${}_3$
• Momentum-dependent magnon lifetime in the metallic non-collinear triangular antiferromagnet CrB2
• Lattice dynamics in the double-helix antiferromagnet FeP