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

Research output: Contribution to journalArticle

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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thermal conductivity
phonons
augmentation
magnetic fields
magnons
mean free path
temperature dependence
single crystals

Keywords

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

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Drastic enhancement of thermal conductivity in the Bose-Einstein condensed state of TlCuCl3. / Kudo, Kazutaka; Yamazaki, Mitsuhiro; Kawamata, Takayuki; Noji, Takashi; Koike, Yoji; Nishizaki, Terukazu; Kobayashi, Norio; Tanaka, Hidekazu.

In: Journal of the Physical Society of Japan, Vol. 73, No. 9, 09.2004, p. 2358-2361.

Research output: Contribution to journalArticle

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, vol. 73, no. 9, pp. 2358-2361. https://doi.org/10.1143/JPSJ.73.2358
Kudo, Kazutaka ; Yamazaki, Mitsuhiro ; Kawamata, Takayuki ; Noji, Takashi ; Koike, Yoji ; Nishizaki, Terukazu ; Kobayashi, Norio ; Tanaka, Hidekazu. / Drastic enhancement of thermal conductivity in the Bose-Einstein condensed state of TlCuCl3. In: Journal of the Physical Society of Japan. 2004 ; Vol. 73, No. 9. pp. 2358-2361.
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AU - Kudo, Kazutaka

AU - Yamazaki, Mitsuhiro

AU - Kawamata, Takayuki

AU - Noji, Takashi

AU - Koike, Yoji

AU - Nishizaki, Terukazu

AU - Kobayashi, Norio

AU - Tanaka, Hidekazu

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N2 - 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.

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