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Realization of Bose-Einstein condensation of dilute magnons in TlCuCl3

T. Nikuni, M. Oshikawa, A. Oosawa, H. Tanaka

cond-mat.stat-mecharXiv:cond-mat/9908118

Abstract

The recent observation [Oosawa et al. J. Phys. : Condens. Matter 11, 265 (1999)] of the field-induced Néel ordering in a spin-gap magnetic compound TlCuCl3 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.

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