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

Abstract

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.

4 pages, 3 figures, to be published in PRL

References in corpus (2)

• Magnetic Superstructure in the Two-Dimensional Quantum Antiferromagnet SrCu2(BO3)2
• Magnetic light scattering in low-dimensional quantum spin systems

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• Critical properties and Bose Einstein Condensation in dimer spin systems
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• Pressure-Induced Successive Magnetic Phase Transitions in the Spin Gap System TlCuCl${}_3$
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• U(1)-Symmetry breaking and violation of axial symmetry in TlCuCl3 and other insulating spin systems
• Magnetoelastic Coupling in the Spin-Dimer System TlCuCl${}_3$
• Macroscopic properties of triplon Bose-Einstein condensates
• Particle-hole symmetry breaking in a spin-dimer system TlCuCl${}_3$ observed at 100 T
• Stability of the homogeneous Bose-Einstein condensate at large gas parameter
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• Critical Properties of Condensation of Field-Induced Triplet Quasiparticles
• Ehrenfest relations and magnetoelastic effects in field-induced ordered phases
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