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Possibility of superconductivity in the repulsive Hubbard model on the Shastry-Sutherland lattice

Takashi Kimura·Kazuhiko Kuroki·Ryotaro Arita·Hideo Aoki
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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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Takashi Kimura, Kazuhiko Kuroki, Ryotaro Arita, Hideo Aoki. 2003-06-06. Possibility of superconductivity in the repulsive Hubbard model on the Shastry-Sutherland lattice. https://doi.org/10.1103/physrevb.69.054501

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