Eur. Phys. J. B 12, 55-59 (1999)
https://doi.org/10.1007/s100510050976

Relationship between resistivity and specific heat in a canonical non-magnetic heavy fermion alloy system: UPt_5-xAu_x

¹ Department of Physics, University of Florida, P.O. Box 118440, Gainesville, Florida 32611, USA
² University of Augsburg, Memminger Str. 6, 86135 Augsburg, Germany

Corresponding author: ^a andraka@phys.ufl.edu

Received: 29 January 1999
Published online: 15 November 1999

Abstract

A comprehensive study of the relationship between the electronic specific heat coefficient (γ) and the temperature square coefficient (A) of the electrical resistivity for a single, cubic, heavy fermion alloy system, UPt_5-xAu_x is presented. In this alloy system, whose low temperature properties are consistent with the Fermi-liquid behavior, γ varies by more than a factor of 10 while the corresponding A coefficient changes by a factor larger than 200. A tracks changes in γ fairly well, but A/γ², postulated to have a universal value for heavy fermions, is not constant and varies from about 10^-6 (x = 0, 0.5) to 10^-5 μΩ 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/γ² and magnetic characteristics such as the paramagnetic Curie-Weiss temperature and the low temperature magnetic susceptibility divided by γ.