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Resistivity saturation is a general phenomenon observed in metals whose electrons have short mean free paths. The approach to saturation can be described rather well by the parallel-resistor formula 1ρ=1ρideal+1ρₛₐₜ, where ρideal is calculated by the usual theory and ρₛₐₜ represents a constant "shunt" resistor. In this work it is shown that the requirement of the minimum time between collisions (Ioffe-Regel criterion), incorporated in the distribution of free times, leads to the parallel-resistor formula.
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M. Gurvitch (1981) studied this question.
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