Relationship between resistivity and specific heat in a canonical non-magnetic heavy fermion alloy system: UPt(5-x)AU(x)

A comprehensive study of the relationship between the electronic specific h eat coefficient (gamma) and the temperature square coefficient (A) of the e lectrical resistivity for a single, cubic, heavy fermion alloy system, UPt5 -xAux is presented. In this alloy system, whose low temperature properties are consistent with the Fermi-liquid behavior, gamma varies by more than a factor of 10 while the corresponding A coefficient changes by a factor larg er than 200. A tracks changes in gamma fairly well, but A/gamma(2), postula ted to have a universal value for heavy fermions, is not constant and varie s from about 10(-6) (x = 0, 0.5) to 10(-5) mu Omega cm (mol K/mJ)(2) (x > 1 .1), thus from a value typical of transition metals to that characteristic of other heavy fermion compounds. We have found a correlation between A/gam ma(2) and magnetic characteristics such as the paramagnetic Curie-Weiss tem perature and the low temperature magnetic susceptibility divided by gamma.