Author： Kimura Takashi Kuroki Kazuhiko Arita Ryotaro Aoki Hideo
Publisher： Springer Publishing Company
ISSN： 0022-2291
Source： Journal of Low Temperature Physics, Vol.134, Iss.1-2, 2004-01, pp. : 805-810
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Abstract
We study superconductivity in the repulsive Hubbard model on the Shastry–Sutherland lattice, where a spin gap exists at the half-filled insulating phase when spin dimerization is strong. By employing the fluctuation-exchange approximation, we find that superconductivity is not favored around halffilling in spite of the spin gap, while superconductivity is favored around quarter-filling. These results suggest that the Fermi surface nesting is more important than spin dimerization for superconductivity.
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