Repulsive Interaction Helps Superconductivity in Fullerides
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概要
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A repulsive interaction model of superconductivity (SC) is studied for tight-binding models with three-fold degenerate molecular orbitals. Taking a weak-coupling approach, we derive dimensionless coupling constants for various symmetries of SC pairs. In addition to anisotropic SC pairs, the s-wave (A_{g}) pairing can also be formed. With the purely repulsive interaction, however, the A_{g} pair is not the most stable in both bcc and fcc lattices. The most stable SC pair for the bcc lattice has the T_{g} symmetry, which is favored by a strongly nesting Fermi surface. In the fcc lattice, various SC symmetries have comparable coupling strengths. With the electron--phonon interaction combined, it is likely that the A_{g} pair becomes the most stable.
- 2013-05-15
著者
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Kuramoto Yoshio
Department Of Applied Physics Faculty Of Engineering Tohoku University
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YAMAZAKI Satoshi
Department of Clinical Laboratory, St. Marianna University School of Medicine
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Yamazaki Satoshi
Department of Physics, Tohoku University, Sendai 980-8578, Japan
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