Abstract
We discuss the contribution of s- d exchange scattering to the electrical resistivity of magnetic metals. We consider the processes in which a spin flip of the s-electron occurs. The s-electron relaxation time is expressed in terms of the transverse spin correlation function of the d-electron spins. We point out that if the frequency spectrum of the spin density fluctuations in the d-electrons cuts off at a frequency low compared to kT, then a temperature independent relaxation time similar to that discussed previously by de Gennes and Friedel is obtained. If a localized model of the d-electrons is employed, then this situation will occur at temperatures large compared to the Curie temperature T c . If one describes the d-electrons by the one band, short-range interaction model, then at temperature large compared to T c , the s-electron relaxation rate is proportional to T 2. If ϵ d is the Fermi energy of the d-electrons, then this relaxation rate is smaller than the de Gennes-Friedel temperature independent rate by a factor of roughly ( kT/ϵ d ) 2. The expression for the relaxation rate at temperatures low compared to T c is exhibited. In this region, the relaxation rate is proportional to T 2.
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