Anisotropic Relaxation Times and the Hall Coefficients ofα-Phase Alloys of theIBMetals

The Hall coefficient ($R_H$) of polycrystalline, $\alpha$-phase alloys of the $\mathrm{I}B$ metals has been determined in the range 10-300°K. $R_H$ shows a dependence upon temperature and solute concentration which might be regarded as very unexpected in a system of monovalent constituents with similar electronic structures. However, it is shown that the data can be interpreted semiempirically in terms of a two-band model which includes different anisotropies of the relaxation times associated with impurity and phonon scattering. Estimates of these anisotropies are obtained for each system and are shown to be in relatively good agreement with those obtained from a similar analysis of deviations from Matthiessen's rule.