Repulsion-induced superconductivity in a multiband Hubbard model
C. Bastide
DOI 10.1103/PhysRevB.41.807 · Physical Review B
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Abstract
A multiband Hubbard Hamiltonian (close to the one used to describe CuO2 planes) is studied with strong-coupling perturbation theory. Two charge-fluctuation mechanisms are described and lead to a spin-independent attraction, which is much larger than the antiferromagnetic interaction. It provides a convincing argument for the possibility of superconductivity induced by repulsive interactions.
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