Phonon Dispersion Curves of High T_c Superconductors.II.YBa_2Cu_3O_7
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概要
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Phonon dispersion curves of YBa.Cu,0, have been calculated by making use offorce constants deduced from those of (La. ,Sr.).Cu0. in a preceeding paper as wellas our experimental results of ultrasonic attenuation and sound velocity forYBa.Cu.O,. Results are resumed as follows. The intra-layer and inter-layer opticcouplings between Cu and O atoms in the incomplete octahedron Cub. inYBa.Cu,O. give rise to the energies of 20 -27 meV at the B. Z. center. These opticphonons with desirable symmetry properties for causing strong electron-phonon in-teractions seem to be favorable to contribute to the high T. superconductivity. In particular, a large contraction of Cu-0 side bond is sticking out from the linear Cu-0chain may be a very advantageous stituation to lead to a stronger electron-phonon in-teraction in YBa.Cu.0. than in (La. .Sr.).Cu0..
- 社団法人日本物理学会の論文
- 1988-03-15
著者
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YASUDA Takashi
Department of Physics, Graduate School of Science, Osaka University
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HORIE Yuuji
Department of Electrical and Electronics Engineering, Kagoshima University
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FUKAMI TAKESHI
Department of Cardiothoracic Surgery, The University of Tokyo Graduate School of Medicine
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Yasuda T
Graduate School Of Science Osaka University
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MASE Shoichi
Department of Physics, Kyushu University
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Mase S
Kyushu Univ. Fukuoka
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Mase Shoichi
Department Of General Education Aichi Institute Of Technology
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Horie Yuuji
Department Of Electrical And Electronics Engineering Kagoshima University
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Fukami Takeshi
Department Of Cardiothoracic Surgery The University Of Tokyo Graduate School Of Medicine
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KUSABA Mari
Department of Physics,Kyusyu University
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Kusaba Mari
Department Of Physics Kyushu University
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Yasuda Takashi
Department Of Civil Engineering Faculty Of Engineering Gifu University
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