Superconductivity in Sr$_2$RuO$_4$ Mediated by Coulomb Scattering

Details Superconductivity in Sr$_2$RuO$_4$ Mediated by Coulomb Scattering Superconductivity in Sr$_2$RuO$_4$ Mediated by Coulomb Scattering

2003-03-29

arxiv.org/abs/cond-mat/0303620v1

Physics

Condensed Matter

Superconductivity

13 pages, 4 figures

Scientific paper

10.1103/PhysRevB.67.134517

We investigate the superconductivity in Sr$_2$RuO$_4$ on the basis of the three-dimensional three-band Hubbard model. We propose a model with Coulomb interactions among the electrons on the nearest-neighbor Ru sites. In our model the intersite Coulomb repulsion and exchange coupling can work as the effective interaction for the spin-triplet paring. This effective interaction is enhanced by the band hybridization, which is mediated by the interlayer transfers. We investigate the possibility of this mechanism in the ground state and find that the orbital dependent spin-triplet superconductivity is more stable than the spin-singlet one for realistic parameters. This spin-triplet superconducting state has horizontal line nodes on the Fermi surface.

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