Strong-coupling properties of unbalanced Eliashberg superconductors

Abstract

In this paper we investigate the thermodynamical properties of ``unbalanced'' superconductors, namely, systems where the electron-boson coupling $\lambda$ is different in the self-energy and in the Cooper channels. This situation is encountered in a variety of situation, as 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 ${\lambda }_c$ where the superconducting critical temperature $T_c$ diverges but the zero temperature gap is still finite. The specific heat, magnetic critical field and the penetration depth are also evaluated.

9 Revtex pages, 7 eps figures included

References in corpus (6)

• Effect of magnetic and non-magnetic impurities on highly anisotropic superconductivity
• Properties of the superconducting state in a two-band model
• Mixed symmetry superconductivity in two-dimensional Fermi liquids
• Pressure-dependence of electron-phonon coupling and the superconducting phase in hcp Fe - a linear response study
• Real-axis direct solution of the d-wave Eliashberg equations and the tunneling density of states in optimally doped Bi2Sr2CaCu2O{8+x}
• Tunneling conductance of SIN junctions with different gap symmetries and non-magnetic impurities by direct solution of real-axis Eliashberg equations

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• Unconventional superfluidity of fermions in Bose-Fermi mixtures
• Universal scaling relations in electron-phonon superconductors
• Constrains on s and d components of electron boson coupling constants in one band d wave Eliashberg theory for high Tc superconductors
• Standard behaviour of Bi2Sr2CaCu2O8+d overdoped
• Correlation between optical phonon softening and superconducting $T_c$ in YBa${}_2$Cu${}_3$O${}_x$ within $d$-wave Eliashberg theory
• Unbalanced superconductivity induced by the constant electron-phonon coupling on a square lattice
• Turning non-superconducting elements into superconductors by quantum confinement and proximity