Abstract
In the limit of small deformation (true strain ) it is possible to derive from curves of the deviation from Matthiessen's rule (DMR) for samples containing dislocations the anisotropy parameter of electron - phonon scattering as a function of temperature. In this case the fitted -curves for copper and silver samples based on the two-group model (TGM) are in excellent agreement with the theoretical calculation of Hasegawa and Kasuya. In contrast -curves derived from low-field Hall effect data within the (uncorrected) TGM are not directly suitable for DMR calculations due to the different averaging of relaxation times for the conductivity and the Hall effect. For understanding DMR curves with the two-group model is insufficient. Up to about 0.2 of normalized DMR seems to result from a DMR between small- and large-angle scattering.
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