Repulsive interaction helps superconductivity in fullerides

Satoshi Yamazaki, Yoshio Kuramoto

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

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 Ag pair is not the most stable in both bcc and fcc lattices. The most stable SC pair for the bcc lattice has the Tg 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 Ag pair becomes the most stable.

Original languageEnglish
Article number054713
Journaljournal of the physical society of japan
Volume82
Issue number5
DOIs
Publication statusPublished - 2013 May 1

Keywords

  • Coulomb interaction
  • Fullerides
  • Multiband
  • Superconductivity

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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