Drastic enhancement of magnon thermal conductivity in the Bose-Einstein condensed state of TlCuCl${}_3$

Abstract

We have measured the thermal conductivity of a TlCuCl${}_3$ single crystal in magnetic fields up to 14 T. It has been found that the temperature dependence of the thermal conductivity exhibits a sharp peak at 4 K in zero field, which is suppressed by the application of magnetic fields up to 7 T. The peak is concluded to be attributable to the enhancement of the thermal conductivity due to phonons because of the formation of a spin-gap state. In high magnetic fields above 7 T, on the other hand, another sharp peak appears around 4 K and this is enhanced with increasing magnetic field. This peak is regarded as being attributable to the enhancement of the thermal conductivity due to magnons and/or phonons because of the drastic extension of the mean free path of magnons and/or phonons in the Bose-Einstein condensed state.

4 pages, 4 figures

References in corpus (10)

• Realization of Bose-Einstein condensation of dilute magnons in TlCuCl${}_3$
• Magnon Heat Transport in (Sr,La)_14Cu_24O_41
• Heat transport by lattice and spin excitations in the spin chain compounds SrCuO_2 and Sr_2CuO_3
• Magnon Dispersion in the Field-Induced Magnetically Ordered Phase of TlCuCl3
• Observation of Field-Induced Transverse Néel Ordering in the Spin Gap System TlCuCl${}_3$
• Thermal Conductivity of the Spin Peierls Compound CuGeO_3
• Specific Heat Study of the Field-Induced Magnetic Ordering in the Spin Gap System TlCuCl${}_3$
• Strong damping of phononic heat current by magnetic excitations in SrCu_2(BO_3)_2
• Soundwave Anomalies in SrCu_{2}(BO_{3})_{2}
• Thermal Conductivity of Mg-doped CuGeO_3

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• Experimental tests for macroscopic phase coherence in magnetic-quasiparticle condensates of insulating spin systems
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