Physics – Condensed Matter – Superconductivity
Scientific paper
2002-01-12
Phys. Rev. B65, 184525 (2002)
Physics
Condensed Matter
Superconductivity
Scientific paper
10.1103/PhysRevB.65.184525
In order to study whether the inter-band nesting can favor superconductivity arising from electron-electron repulsion in a three-dimensional system, we have looked at the repulsive Hubbard model on a stack of honeycomb (i.e., non-Bravais) lattices with the FLEX method, partly motivated by the superconductivity observed in MgB2. By systematically changing the shape of Fermi surface with varied band filling n and the third-direction hopping, we have found that the pair scattering across the two-bands is indeed found to give rise to gap functions that change sign across the bands and behave as an s- or d-wave within each band. This implies (a) the electron repulsion can assist gapful pairing when a phonon-mechanism pairing exists, and (b) the electron repulsion alone, when strong enough, can give rise to a d-wave-like pairing, which should be, for a group-theoretic reason, a time-reversal broken d+id with point nodes in the gap.
Aoki Hideo
Arita Ryotaro
Kuroki Kazuhiko
Onari Seiichiro
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