Superconducting phases in the presence of Coulomb interaction: From weak to strong correlations

Tadeusz Domański; Karol I. Wysokiński

doi:10.1103/PhysRevB.59.173

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Superconducting phases in the presence of Coulomb interaction: From weak to strong correlations

Tadeusz Domański, Karol I. Wysokiński

DOI 10.1103/PhysRevB.59.173 · Physical Review B

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Abstract

We study the evolution of the superconducting phases in a model with competing short-range attractive (W) and on-site repulsive (U) interactions. The influence of the correlations on the phase diagram of s− and d-wave superconductors is studied by means of various approximations. The knowledge of the normal state correlation effects allows the tracking of the influence of U on the superconductivity in correlated systems. We have found the qualitatively different response of the superconducting phases in systems with W<Ucr, when the system ceases to superconduct for large enough U, and in the limit of strong W>Ucr, when the system remains superconducting for arbitrarily large U.