Abstract
We have solved a generalized set of three coupled Eliashberg gap equations which incorporate the effect of an energy-dependent electronic density of states N(ϵ). The model used for N(ϵ) was chosen on the basis of recent band structure calculations and the electron-phonon spectral density taken from tunneling results in Nb 3Sn. The solutions are used to study of the effect of N(ϵ) on single particle tunneling into a superconductor. The theoretical characteristics so obtained are “inverted” in the conventional way and the procedure is critically assessed.
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