Bose-Einstein condensation of dilute magnons in TlCuCl3.

@article{Nikuni2000BoseEinsteinCO,
  title={Bose-Einstein condensation of dilute magnons in TlCuCl3.},
  author={T. Nikuni and M. Oshikawa and A. Oosawa and H. Tanaka},
  journal={Physical review letters},
  year={2000},
  volume={84 25},
  pages={
          5868-71
        }
}
The recent observation [A. Oosawa et al., J. Phys. Condens. Matter 11, 265 (1999)] of the field-induced Neel ordering in the spin-gap magnetic compound TlCuCl3 is interpreted as a Bose-Einstein condensation of magnons. A Hartree-Fock-type calculation based on this picture is shown to describe the temperature dependence of the magnetization well. 
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