https://doi.org/10.1007/s100510050976
Relationship between resistivity and specific heat in a canonical non-magnetic heavy fermion alloy system: UPt5-xAux
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
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, UPt5-xAux 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.
PACS: 71.27.+a – Strongly correlated electron systems; heavy fermions / 71.10.Ay – Fermi-liquid theory and other phenomenological models / 75.30.Mb – Valence fluctuation, Kondo lattice, and heavy-fermion phenomena
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 1999