Using spin dynamics simulations we predict the splitting of the longitudinal spin wave peak in all antiferromagnets with single site anisotropy into two peaks separated by twice the energy gap at the Brillouin zone center. This phenomenon has yet to be observed experimentally but can be easily investigated through neutron scattering experiments on MnF2 and FeF2. We have also determined that for all classical Heisenberg models the longitudinal propagative excitations are entirely multiple spin-wave in nature.
@article{arxiv.cond-mat/9910031,
title = {Longitudinal magnetic excitations in classical spin systems},
author = {Alex Bunker and D. P. Landau},
journal= {arXiv preprint arXiv:cond-mat/9910031},
year = {2009}
}
Comments
four pages three figures, the last two postscript files are two parts of the third figure