Coupling of phonons and spin waves in triangular antiferromagnet

Details Coupling of phonons and spin waves in triangular antiferromagnet Coupling of phonons and spin waves in triangular antiferromagnet

2007-04-26

arxiv.org/abs/0704.3510v2

Physical Review B 76, 054431 (2007)

Physics

Condensed Matter

Strongly Correlated Electrons

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

Scientific paper

10.1103/PhysRevB.76.054431

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.

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