Anisotropy in Electron-Phonon Interactions and Superconducting Transition in a Two-Dimensional system
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概要
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The effect of anisotropy is studied for superconductivity due to electron-phononcoupling. Parameters in the model are so determined that they can reproduce theresults of band calculations and the phonon dispersion relations of La. .Sr.Cu0..The electron-phonon coupling strength and the dopant concentration are varied overa wide range. We first calculate the phonon polarization part and then solvenumerically the Eliashberg-Nambu equation which includes anisotropies of Fermi sur-face, the phonons, and the coupling. It turns out that the electron-phonon coupling isless anisotropic than the electronic density of states, even when the Fermi surface isclose to the van Hove singularity. The superconducting transition temperature ispredominantly determined by the averaged electron-phonon coupling over the Fermisurface. As carrier concentration changes and the Fermi surface crosses the configura-tion with the van Hove singularity, the transition temperature is expected to have acusp.
- 社団法人日本物理学会の論文
- 1989-09-15
著者
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Wada Yasushi
Department Of Physics University Of Tokyo : Tohoku University Of Art And Design
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Wada Yasushi
Department Of Physics University Of Tokyo
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YONEMITSU Kenji
Department of Physics,University of Tokyo
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Wada Yasuhiro
Department Of Materials Science Faculty Of Science Hiroshima University
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Yonemitsu Kenji
Department Of Physics University Of Tokyo
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Wada Yasushi
Department of Materials Science,Faculty of Science,Hiroshima University
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