Pressure dependence of charge distribution along TCNQ columns in Cs2TCNQ3
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概要
- 論文の詳細を見る
Pressure dependence of the charge distribution along the columns of tetracyanoquinodimethane (TCNQ) molecules in Cs2TCNQ3, which is a semiconducting 1/3-filled Hubbard system with the optical energy gap of 0.3 eV at ambient conditions, has been studied by the infrared and visible absorption experiments. An electronic phase transition is found to occur at around 3.5 GPa, in accordance with the previously reported insulator-to-metal transition. Our result suggests that this phase transition accompanies a symmetry change in the relative position of the TCNQ− radical molecules sandwiching the TCNQ0 neutral molecule. In addition, the π* electrons, which are localized on the TCNQ− molecules in the low-pressure phase, are delocalized significantly in the high-pressure phase. However, in the high-pressure phase the π* electrons still maintain the localizing character. The charge-transfer degree of the neutral-like and radical-like molecules of the high-pressure phase is estimated to be ρ = 0.46-0.50 and 0.75-0.77, respectively.
- 社団法人日本物理学会の論文
- 2003-07-15
著者
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KURODA Noritaka
Department of Materials Science and Engineering, Graduate School of Science and Technology, Kumamoto
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黒田 規敬
熊本大学大学院
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KOBAYASHI Michihiro
Graduate School of Medicine, Kyoto University
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Kobayashi Michihiro
Graduate School Of Medicine Kyoto University
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SUGIMOTO Toyonari
Research Institute for Advanced Science and Technology, Osaka Prefecture University
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Kagayama Tomoko
Department of Mechanical Engineering and Materials Science, Kumamoto University
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Kuroda Noritaka
Department Of Materials Science And Engineering Graduate School Of Science And Technology Kumamoto U
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HASANUDIN HASANUDIN
Department of Mechanical Engineering and Materials Science, Faculty of Engineering, Kumamoto Univers
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Hamai Miho
Institute For Materials Research Tohoku University
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Kagayama Tomoko
Department Of Mechanical Engineering And Materials Science Faculty Of Engineering Kumamoto Universit
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Sugimoto Toyonari
Research Institute For Advanced Science And Technology Osaka Prefecture University
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Kuroda Noritaka
Department Of Mechanical Engineering And Materials Science Faculty Of Engineering Kumamoto Universit
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Sugimoto T
Toyota Motor Corporation
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Kuroda N
Nec Corp. Ibaraki Jpn
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Kobayashi Michihiro
Graduate School Of Engineering Science Osaka University
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