Bose-Einstein condensation of magnons in TlCuCl$_3$
Strongly Correlated Electrons
2007-05-23 v1
Abstract
A quantitative study of the field-induced magnetic ordering in TlCuCl in terms of a Bose-Einstein condensation (BEC) of magnons is presented. It is shown that the hitherto proposed simple BEC scenario is in quantitative and qualitative disagreement with experiment. It is further shown that even very small Dzyaloshinsky-Moriya interactions or a staggered tensor component of a certain type can change the BEC picture qualitatively. Such terms lead to a nonzero condensate density for all temperatures and a gapped quasiparticle spectrum. Including this type of interaction allows us to obtain good agreement with experimental data.
Cite
@article{arxiv.cond-mat/0406262,
title = {Bose-Einstein condensation of magnons in TlCuCl$_3$},
author = {J. Sirker and A. Weisse and O. P. Sushkov},
journal= {arXiv preprint arXiv:cond-mat/0406262},
year = {2007}
}
Comments
2 pages, 2 figures, submitted to SCES'04