Drastic enhancement of thermal conductivity in the Bose-Einstein condensed state of TlCuCl3

Kazutaka Kudo, Mitsuhiro Yamazaki, Takayuki Kawamata, Takashi Noji, Yoji Koike, Terukazu Nishizaki, Norio Kobayashi, Hidekazu Tanaka

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15 Citations (Scopus)

Abstract

We have measured the thermal conductivity of a TlCuCl3 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.

Original languageEnglish
Pages (from-to)2358-2361
Number of pages4
JournalJournal of the Physical Society of Japan
Volume73
Issue number9
DOIs
Publication statusPublished - Sep 2004
Externally publishedYes

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Keywords

  • Bose-Einstein condensation
  • Dimer
  • Magnon
  • Phonon
  • Spin gap
  • Thermal conductivity

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Kudo, K., Yamazaki, M., Kawamata, T., Noji, T., Koike, Y., Nishizaki, T., Kobayashi, N., & Tanaka, H. (2004). Drastic enhancement of thermal conductivity in the Bose-Einstein condensed state of TlCuCl3. Journal of the Physical Society of Japan, 73(9), 2358-2361. https://doi.org/10.1143/JPSJ.73.2358