Superconductivity in a strongly correlated one-band system

T. Domański; K. I. Wysokiński; R. Ramakumar

doi:10.1103/PhysRevB.54.3058

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Superconductivity in a strongly correlated one-band system

T. Domański, K. I. Wysokiński, R. Ramakumar

DOI 10.1103/PhysRevB.54.3058 · Physical Review B

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Abstract

We study superconductivity in the extended Hubbard model with a strong on-site repulsion U and weak attractive density-density interaction Vij. The electron correlation effects, beyond the weak-coupling regime of U, are included approximately by employing Hubbard decoupling approximations. The formulas for superconducting transition temperature Tc of the present approach are compared to those obtained with the strong-coupling expansion and slave-boson techniques. The methods share some common features. We discuss behavior of Tc for superconducting phases with s- and d-wave symmetry of the superconducting order parameter. In contrast to the mean-field treatment of U, we find that the strong on-site repulsion does not destroy superconductivity induced by Vij<0 even when U≫|Vij|. © 1996 The American Physical Society.