Concentration dependence of the anomalous thermoelectric power of dilute magnetic alloys

Abstract

It has been pointed out recently by one of us (M.S.R.C.) that the variation of the Kondo slopesd (of the ρ/c vs. lnT curves) of dilute magnetic alloys containing a finite solute concentrationc bears a close resemblance to the variation of the functionf (=cos⁶ ν cos2ν) with the phase shift ν for ordinary spin-independent scattering. Sinced is itself primarily determined byf the inference is that ν is a function ofc when the criterion of infinite dilution is violated. For infinite dilutions theory expects the anomalous thermoelectric power in such alloys to be independent ofc as well as ofT. Taking the experimentally observed extremum in the TEP (S _m) as an approximation to such a TEP, we report, for finite solute concentrations, the variation ofS _m withc, to correspond with the variation off′(=cos⁶ ν sin2ν) with ν. This substantiates the above inference. In fact, one can predict the sign and the variation (withc) ofd, knowing that ofS _m, and vice versa, for a given dilute magnetic alloy system.