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We present a theoretical study of the density of states and supercurrent indiffusive superconductor-normal metal-superconductor (SNS) junctions. Inparticular, we study the influence on these two equilibrium properties of bothan arbitrary transparency of the SN interfaces and the presence of spin-flipscattering in the normal wire. We show that the minigap that is present in thespectrum of the diffusive wire is very sensitive to the interface transmission.More mportantly, we show that at arbitrary transparency the minigap replacesthe Thouless energy as the relevant energy scale for the proximity effect,determining for instance the temperature dependence of the critical current. Wealso study in detail how the critical current is suppressed by the effect ofspin-flip scattering, which can be due to either magnetic impurities or, undercertain circumstances, to an external magnetic field. Our analysis based on thequasiclassical theory of diffusive superconductors can be very valuable toestablish quantitative comparisons between experiment and theory.

Density of states and supercurrent in diffusive SNS junctions: role of nonideal interfaces and spin-flip scattering