%0 Journal Article
%T Realization of Bose-Einstein condensation of dilute magnons in TlCuCl$_3$
%A T. Nikuni
%A M. Oshikawa
%A A. Oosawa
%A H. Tanaka
%J Physics
%D 1999
%I arXiv
%R 10.1103/PhysRevLett.84.5868
%X The recent observation [Oosawa et al. J. Phys. : Condens. Matter {\bf 11}, 265 (1999)] of the field-induced N\'{e}el ordering in a spin-gap magnetic compound TlCuCl$_3$ is interpreted as a Bose-Einstein Condensation of magnons. A mean-field calculation based on this picture is shown to describe well the temperature dependence of the magnetization. The present system opens a new area for studying Bose-Einstein condensation of thermodynamically large number of particles in a grand-canonical ensemble.
%U http://arxiv.org/abs/cond-mat/9908118v1