Evidence for non-Fermi liquid behavior in the Kondo alloy Y_{1-x}U_{x}Pd_{3}

Abstract

We present measurements of electrical resitivity \ensuremath{\rho}(T), specific heat C(T), entropy S(T), and magnetic susceptibility \ensuremath{\chi}(T) as functions of temperature T for the alloy system ${\mathrm{Y}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$${\mathrm{U}}_{\mathit{x}}$${\mathrm{Pd}}_{3}$. For x=0.2, \ensuremath{\rho}(T)/\ensuremath{\rho}(0) is almost linear in T for 0.2\ensuremath{\le}T\ensuremath{\le}20 K, and C(T)/T\ensuremath{\sim}-ln(\ensuremath{\alpha}T) for 0.6T16 K. Also, the added molar entropy per U, \ensuremath{\Delta}S(T)-\ensuremath{\Delta}S(0) appears to saturate to (R/2)ln(2), suggesting that \ensuremath{\Delta}S(0)\ensuremath{\approxeq}(R/2)ln(2). We argue that our data provide comprehensive evidence in a dilute alloy for the two-channel quadrupolar Kondo effect (${\mathit{T}}_{\mathit{K}}$\ensuremath{\approxeq}42 K) with concomitant ``marginal Fermi liquid'' phenomenology.