Bose-Einstein condensation of magnons in TlCuCl$_3$

Details Bose-Einstein condensation of magnons in TlCuCl$_3$ Bose-Einstein condensation of magnons in TlCuCl$_3$

2004-06-11

arxiv.org/abs/cond-mat/0406262v1

Physica B 359-361, 1318 (2005)

Physics

Condensed Matter

Strongly Correlated Electrons

2 pages, 2 figures, submitted to SCES'04

Scientific paper

10.1016/j.physb.2005.01.392

A quantitative study of the field-induced magnetic ordering in TlCuCl$_3$ 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 $g$ 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.

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