Abstract
The anisotropic electron relaxation time in K caused by the freezing out of Umklapp processes on certain areas of the Fermi surface is predicted to give a temperature-dependent component to the low-field Hall effect at low temperatures. A previous attempt to demonstrate this component was defeated by the unsuitability of the existing data which contain an overwhelming high-field contribution in the temperature range of interest. To provide more suitable data, we have measured the Hall effect of polycrystalline K as the conditions tend towards the low-field limit. It is shown how the results can be qualitatively interpreted in terms of a competition between this predicted Umklapp component and the high-field tendencies inherent in the galvano-magnetic effect.
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