Strong-coupling properties of unbalanced Eliashberg superconductors

E. Cappelluti; G. A. Ummarino

doi:10.1103/PhysRevB.76.104522

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Strong-coupling properties of unbalanced Eliashberg superconductors

E. Cappelluti, G. A. Ummarino

DOI 10.1103/PhysRevB.76.104522 · Physical Review B

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Abstract

In this paper we investigate the thermodynamical properties of “unbalanced” superconductors, namely, systems where the electron-boson coupling λ is different in the self-energy and in the Cooper channels. This situation is encountered in a variety of situations, for instance, in d-wave superconductors. Quite interesting is the case where the pairing in the self-energy is smaller than the one in the gap equation. In this case we predict a finite critical value λc where the superconducting critical temperature Tc diverges but the zero temperature gap is still finite. The specific heat, magnetic critical field, and the penetration depth are also evaluated.