Coupling of phonons and spin waves in triangular antiferromagnet

Abstract

We investigate the influence of the spin-phonon coupling in the triangular antiferromagnet where the coupling is of the exchange-striction type. The magnon dispersion is shown to be modified significantly at wave vector (2pi,0) and its symmetry-related points, exhibiting a roton-like minimum and an eventual instability in the dispersion. Various correlation functions such as equal-time phonon correlation, spin-spin correlation, and local magnetization are calculated in the presence of the coupling.

6 pages, 5 figures; references added, minor text revisions, submitted to PRB

References in corpus (10)

• Spin current and magneto-electric effect in non-collinear magnets
• Role of the Dzyaloshinskii-Moriya interaction in multiferroic perovskites
• Magnetically driven ferroelectric order in Ni${}_3$V${}_2$O${}_8$
• Possible evidence for electromagnons in multiferroic manganites
• The quadrupolar phases of the S=1 bilinear-biquadratic Heisenberg model on the triangular lattice
• Dynamical magneto-electric coupling in helical magnets
• Spin Nematic Phase in S=1 Triangular Antiferromagnets
• Electromagnons in multiferroic YMn2O5 and TbMn2O5
• Bond electronic polarization induced by spin
• Possible ferro-spin nematic order in NiGa2S4

Cited by in corpus (11)

• Spontaneous decays of magneto-elastic excitations in noncollinear antiferromagnet (Y,Lu)MnO3
• General method for atomistic spin-lattice dynamics with first principles accuracy
• Hexagonal RMnO${}_3$: a model system for 2D triangular lattice antiferromagnets
• Electromagnon dispersion probed by inelastic x-ray scattering
• Magnon-phonon coupling and two-magnon continuum in two-dimensional triangular antiferromagnet CuCrO2
• Evidence for magnon-phonon coupling in the topological magnet Cu${}_3$TeO${}_6$
• Elastic constants and ultrasonic attenuation in the cone state of the frustrated antiferromagnet Cs_2CuCl_4
• Magnon-polaron excitations in the noncollinear antiferromagnet Mn${}_3$Ge
• Hybridization and Decay of Magnetic Excitations in two-dimensional Triangular Lattice Antiferromagnets
• Observation of Unusual Magnetoelastic Effects in a Quasi-1D Spiral Magnet
• An Effective Field Theory of Magneto-Elasticity