Bose-Einstein Condensation of Quasi-Two-Dimensional Frustrated Quantum Magnet (CuCl)LaNb_2O_7(Condensed matter: electronic structure and electrical, magnetic, and optical properties)
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概要
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A quasi-two-dimensional S=1/2 Heisenberg square-lattice antiferromagnet (CuCI)LaNb_2O_7 is studied by specific heat and magnetic susceptibility measurements in external fields up to 14T. The experimental results in low fields verify the absence of the order-disorder transition, as reported previously. By further application of magnetic fields, we obtain direct evidence for the phase transition, which can be interpreted as the Bose-Einstein condensation (BEC) of magnons. However, the critical field of 10T significantly deviates from that estimated from the zero-field gap, indicating that, unlike known experimental examples, the one-magnon mode is not a primary source to drive the BEC.
- 社団法人日本物理学会の論文
- 2007-09-15
著者
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網代 芳民
京大院理
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TSUJIMOTO Yoshihiro
Department of Chemistry, Graduate School of Science, Kyoto University
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KITADA Atsushi
Department of Chemistry, Graduate School of Science, Kyoto University
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KAGEYAMA Hiroshi
Department of Chemistry, Graduate School of Science, Kyoto University
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AJIRO Yoshitami
Department of Chemistry, Graduate School of Science, Kyoto University
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YOSHIMURA Kazuyoshi
Department of Chemistry, Graduate School of Science, Kyoto University
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Kitada Atsushi
Department Of Chemistry Graduate School Of Science Kyoto University
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網代 芳民
Department Of Chemistry Kyoto University:crest Japan Science And Technology Corporation (jst)
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Ajiro Y
Department Of Chemistry Graduate School Of Science Kyoto University
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陰山 洋
Department Of Chemistry Graduate School Of Science Kyoto University
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Yoshimura Kazuyoshi
Department Of Chemistry Graduate School Of Science Kyoto University
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Tsujimoto Yoshihiro
Department Of Chemistry Graduate School Of Science Kyoto University
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HIROI Zenji
Institute for Solid State Physics, University of Tokyo
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KITANO Taro
Department of Chemistry, Graduate School of Science, Kyoto University
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Kageyama Hiroshi
Department Of Chemistry Graduate School Of Science Kyoto University
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Yoshimura Kazuyoshi
Department Of Applied Science Tokyo Electrical Engineering College
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Kageyama Hiroshi
Department Of Applied Chemistry Faculty Of Engineering Osaka University
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Ajiro Y
Department Of Physics Kyushu University
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Hiroi Zenji
Institute For Chemical Research Kyoto University
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Kitano Taro
Department Of Chemistry Graduate School Of Science Kyoto University
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Ajiro Yoshitami
Department Of Applied Physics Fukui University
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Ajiro Yoshitami
Department Of Applied Physics Faculty Of Engineering Fukui University
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