Bose-Einstein condensation of magnons in TlCuCl${}_3$

Abstract

A quantitative study of the field-induced magnetic ordering in TlCuCl${}_3$ in terms of a Bose-Einstein condensation (BEC) of magnons is presented. It is shown that the hitherto proposed simple BEC scenario is in quantitative and qualitative disagreement with experiment. It is further shown that even very small Dzyaloshinsky-Moriya interactions or a staggered $g$ tensor component of a certain type can change the BEC picture qualitatively. Such terms lead to a nonzero condensate density for all temperatures and a gapped quasiparticle spectrum. Including this type of interaction allows us to obtain good agreement with experimental data.

arXiv comment2 pages, 2 figures, submitted to SCES'04

References in corpus (7)

• Realization of Bose-Einstein condensation of dilute magnons in TlCuCl${}_3$
• Field- and pressure-induced magnetic quantum phase transitions in TlCuCl_3
• Magnon Dispersion in the Field-Induced Magnetically Ordered Phase of TlCuCl3
• Novel approach to description of spin liquid phases in low-dimensional quantum antiferromagnets
• Spin-resonance modes of the spin-gap magnet TlCuCl_3
• Sound attenuation on the Bose-Einstein condensation of magnons in TlCuCl_3
• Consequences of spin-orbit coupling for the Bose-Einstein condensation of magnons

Cited by in corpus (3)

• Integrable models and quantum spin ladders: comparison between theory and experiment for the strong coupling ladder compounds
• Width of the longitudinal magnon in the vicinity of the O(3) quantum critical point
• The field-induced magnetic ordering transition in TlCuCl${}_3$