Drastic Enhancement of Thermal Conductivity in the Bose-Einstein Condensed State of TlCuCl_3(Condensed Matter : Structure, Mechanical and Thermal Properties)
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概要
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We have measured the thermal conductivity of a TlCuCl_3 single crystal in magnetic fields up to 14T. It has been found that the temperature dependence of the thermal conductivity exhibits a sharp peak at 4K in zero field, which is suppressed by the application of magnetic fields up to 7T. 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 7T, on the other hand, another sharp peak appears around 4K 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.
- 社団法人日本物理学会の論文
- 2004-09-15
著者
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Kobayashi Norio
Institute For Materials Research Tohoku University
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TANAKA Hidekazu
Research Center for Low Temperature Physics, Tokyo Institute of Technology
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KOIKE Yoji
Department of Applied Physics, Graduate School of Engineering, Tohoku University
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小島 憲道
東大総合文化
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黒田 規敬
熊本大学大学院
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小林 長夫
東北大学大学院理学研究科
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佐藤 知矢
Department Of Physics Faculty Of Science Shinshu University
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KAWAMATA Takayuki
Department of Applied Physics, Tohoku University
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NOJI Takashi
Department of Applied Physics, Tohoku University
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KUDO Kazutaka
Institute for Materials Research, Tohoku University
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Kobayashi N
Institute For Materials Research Tohoku University
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Koike Yoji
Department Applied Physics Graduate School Of Engineering Tohoku University
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Noji Takashi
Department Of Applied Physics Faculty Of Engineering Tohoku University
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Kudo K
Institute For Materials Research Tohoku University
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Kudo Kazutaka
Department Of Applied Physics Graduate School Of Engineering Tohoku University
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NISHIZAKI Terukazu
Institute for Materials Research, Tohoku University
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Kuroda Noritaka
Discovery Research Laboratories V Discovery Research Division Takeda Chemical Industries Ltd.
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Noto K
Institute For Materials Research Tohoku University
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Hiraoka T
Faculty Of Science And Engineering Saga University
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Kojima N
Graduate School Of Arts And Sciences University Of Tokyo
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Kobayashi N
Tohoku Univ. Sendai Jpn
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Kobayashi N
Institute For Materials Research Tohoku University Katahira
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KOBAYASHI Norio
The Research Institute for Iron,Steel and Other Metals,Tohoku University
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Kawamata Takayuki
Department Of Applied Physics Tohoku University:crest Japan Science And Technology Agency (jst):(pre
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Nishizaki Terukazu
Institute For Materials Research Tohoku University
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Yamazaki M
Department Of Applied Physics Graduate School Of Engineering Tohoku University
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YAMAZAKI Mitsuhiro
Department of Applied Physics, Graduate School of Engineering, Tohoku University
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Kuroda N
Nec Corp. Ibaraki Jpn
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Nojima T
Institute For Materials Research Tohoku University
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Kobayashi Norio
Institute For Materials Recearch Tohoku University
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Tanaka Hidekazu
Research Center For Low Temperature Physics Tokyo Institute Of Technology
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Kobayashi Norio
Faculty Of Engineering Iwate University
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小島 憲道
東大院総合
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