Heavy-non-Fermi-liquid behavior in U(Cu,Pd)5

Abstract

We report measurements of the lattice constant, electrical resistivity, magnetic susceptibility, and specific heat of ${\mathrm{UCu}}_{5\mathrm{-}\mathit{x}}$ ${\mathrm{Pd}}_{\mathit{x}}$ for 0≤x≤2.3. Alloys corresponding to x<0.75 are antiferromagnets, with ${\mathit{T}}_{\mathit{N}}$ strongly concentration dependent. χ and C for x≥2 are consistent with spin-glass freezing. C/T for ${\mathrm{UCu}}_{3.5}$ ${\mathrm{Pd}}_{1.5}$ diverges logarithmically as T→0 K while ρ is linear in T at the lowest temperatures. The thermodynamic properties of this alloy are inconsistent with the Fermi-liquid theory down to at least 0.32 K.