Observation of non-Fermi-liquid behavior in U_{0.2}Y_{0.8}Pd_{3}

Abstract

We present data for the temperature and magnetic-field dependence of the specific heat, magnetic susceptibility, magnetization, and electrical resistivity of ${\mathrm{U}}_{0.2}$${\mathrm{Y}}_{0.8}$${\mathrm{Pd}}_{3}$. The data demonstrate the scaling behavior of the thermodynamic quantities at temperatures up to 10 K and magnetic fields up to 14 T. The magnetic field scales as ${\mathit{T}}^{1.3}$. The zero-field specific heat varies with temperature as -T lnT. The magnetic field strongly affects the thermodynamics, but the magnetoresistance is very small (-2% at T=0.36 K and H=14 T). We argue that our data are inconsistent with any single-impurity interpretation. We suggest that the system has a second-order phase transition at T=0.