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

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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• Emergent Bound States and Impurity Pairs in Chemically Doped Shastry-Sutherland System
• Doping Effects on the two-dimensional Spin Dimer Compound $SrC{u}_2(B{O}_3{)}_2$
• Mott transition and Antiferromagnetic Metal on Shastry-Sutherland Lattice
• Absence of hole pairing in a simple t-J model on the Shastry-Sutherland lattice
• Impurity-induced singlet breaking in SrCu2(BO3)2
• Spin-polaron excitations in a doped Shastry-Sutherland model
• In-plane substitution effect on the magnetic properties of two-dimensional Spin-gap system SrCu${}_2$(BO${}_3$)${}_2$