The true low-field Hall coefficient of high-purity coefficient of high-purity silver and silver containing low-density defects at low temperatures

Previous low-temperature Hall measurements on nominally pure noble metals have involved transition into the high-field regime. Hall coefficient (R H ) results are reported on several high-purity samples of Ag and Ag containing low concentrations of Au, Cd, and dislocations in fields down to 0.0085 T (85G) sufficient to ensure true low-field conditions, and examine the results in terms of a changing relaxation time anisotropy factor x= tau N / tau B of a two-group model with neck (N) and belly (B) regions of the Fermi surface. A new auxiliary quantity is introduced viz. the characteristic peak Hall coefficient which is a single function of temperature, characteristic of a pure metal, and is the locus of the peaks observed in R H on dilute alloys irrespective of the nature or concentration of nonmagnetic impurities or defects present.