We use the dynamical mean field method to study the high-temperature resistivity of electrons strongly coupled to phonons. The results reproduce the qualitative behavior of the temperature and disorder dependence of the resistivity of ``A-15'' materials which is normally described in terms of saturation, but imply that the resistivity does not saturate. Rather, a change in temperature dependence occurs when the scattering becomes strong enough to cause a breakdown of the Migdal approximation.
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Millis et al. (1999) studied this question.
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