Abstract
The electron-phonon mass enhancement factor λ and the electrical resistivity of Mo are calculated both by the APW rigid muffin-tin approximation (RMTA) and the tightbinding approximation. The detailed analysis of the results shows that RMTA disregards both the positive contribution from the outside of the inscribed sphere and the negative contribution due to the electron response to the perturbation. The value of λ or the resistivity at high temperatures given by RMTA seems to be fairly close to the true value owing to the fortunate cancellation of the errors.
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