Abstract
We examine the applicability of the standard McMillan inversion of Eliashberg's equations for superconductors with a nonconstant electronic density of statesN(e). We do this usign simple models forN(e) and a realistically shapedN(e) taken from recent band structure work for Nb3Sn. It turns out that peak structure inN(e) near eF may lead to gross errors in the derived Eliashberg function α2F(θ) when the energy dependence ofN(e) is omitted in the inversion procedure. For Nb3Sn, this leads to a 40% overestimate of λ when α2F(θ) is evaluated via the standard McMillan program.
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