Possibility of superconductivity in the repulsive Hubbard model on the Shastry-Sutherland lattice
Takashi Kimura, Kazuhiko Kuroki, Ryotaro Arita, Hideo Aoki
Abstract
Possibility of superconductivity from electron repulsion in the Shastry-Sutherland lattice, which has a spin gap at half filling, is explored with the repulsive Hubbard model in the fluctuation-exchange approximation. We find that, while superconductivity is not favored around the half-filling, superconductivity is favored around the quarter-filling. Our results suggest that the Fermi surface nesting is more important than the spin dimerization for superconductivity.
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