In this study we calculate the fraction of condensed magnetic quasiparticles of TlCuCl3 from magnetization M(T,H)-data. It is independent of the direction of the magnetic field and slightly decreases with increasing magnetic field.
@article{arxiv.0806.2519,
title = {The fraction of Bose-Einstein condensed triplons in TlCuCl3 from magnetization M(T,H)-data},
author = {R. Dell'Amore and K. Krämer and A. Schilling},
journal= {arXiv preprint arXiv:0806.2519},
year = {2009}
}