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We propose that when the Fermi level lies within a wide band and also lies close to but not within a coexisting narrow band, high-Tc superconductivity may take place due to the large number of interband pair scattering channels and the small renormalization of the quasiparticles. We show using the fluctuation exchange method that this mechanism works for the Hubbard model on a ladder lattice with diagonal hoppings. From this viewpoint, we give a possible explanation for the low Tc for the actual hole-doped ladder compound, and further predict a higher Tc for the case of electron doping.
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Kuroki et al. (2005) studied this question.
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