Abstract
Precise measurements of the low field Hall coefficient RH of pure copper and palladium have been made between 2K and 16 K by the use of SQUID. Residual resistance ratios of the Cu and Pd samples were about 22000 and 1500 respectively. We have deduced the temperature dependence of the relaxation times from the RH and the electrical resistivity data using a two group model. For Cu the relaxation times τ of the neck (N) and the belly (B) regions of the Fermi surface vary as 1/τN∼T3.3 and 1/τB∼T5 and for Pd 1/τh∼T1.9 and 1/τe∼T3, where τh and τe are the relaxation times Γ of the Γ centered electron and the open hole sheets respectively. These results are discussed in terms of the anisotropy of electron-phonon and electron-electron scattering.
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