Sound attenuation on the Bose-Einstein condensation of magnons in TlCuCl_3

Details Sound attenuation on the Bose-Einstein condensation of magnons in TlCuCl_3 Sound attenuation on the Bose-Einstein condensation of magnons in TlCuCl_3

2003-06-24

arxiv.org/abs/cond-mat/0306623v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 figures, to be published in PRL

Scientific paper

10.1103/PhysRevLett.91.057201

We investigated experimentally and theoretically sound attenuation in the quantum spin system TlCuCl_3 in magnetic fields at low temperatures. Near the point of Bose-Einstein condensation (BEC) of magnons a sharp peak in the sound attenuation is observed. The peak demonstrates a hysteresis as function of the magnetic field pointing to a first-order contribution to the transition. The sound damping has a Drude-like form arising as a result of hardcore magnon-magnon collisions. The strength of the coupling between lattice and magnons is estimated from the experimental data. The puzzling relationship between the transition temperature and the concentration of magnons is explained by their "relativistic" dispersion.

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