In the 2D attractive Hubbard model, Tc is enhanced near Van Hove singularities only for weak interactions, while the global maximum Tc occurs at intermediate coupling away from the singularity.
Dzyaloshinskii, Maximal increase of the superconduct- ing transition temperature due to the presence of van’t hoff singularities, JETP Lett46(1987)
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Superconductivity near two-dimensional Van Hove singularities: a determinant quantum Monte Carlo study
In the 2D attractive Hubbard model, Tc is enhanced near Van Hove singularities only for weak interactions, while the global maximum Tc occurs at intermediate coupling away from the singularity.