Realization of Bose-Einstein condensation of dilute magnons in TlCuCl$_3$
T. Nikuni, M. Oshikawa, A. Oosawa, H. Tanaka
TL;DR
This paper interprets the field-induced magnetic ordering in TlCuCl3 as a Bose-Einstein condensation of magnons, supported by mean-field calculations matching experimental magnetization data, opening new research avenues in large-particle BEC systems.
Contribution
It provides a theoretical interpretation of magnetic ordering as magnon BEC in TlCuCl3 and demonstrates the system as a platform for studying large-particle BEC in a grand-canonical ensemble.
Findings
Mean-field calculations match temperature-dependent magnetization data.
Magnetic ordering interpreted as Bose-Einstein condensation of magnons.
System enables exploration of BEC with large particle numbers.
Abstract
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 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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