Non-Fermi-liquid behavior and magnetic order in theU1−xYxPd2Al3system

Measurements of the low-temperature electrical resistivity \ensuremath{\rho}, specific heat C, and magnetic susceptibility \ensuremath{\chi} of the ${\mathrm{U}}_{1\ensuremath{-}x}{\mathrm{Y}}_{x}{\mathrm{Pd}}_{2}{\mathrm{Al}}_{3}$ system reveal non-Fermi-liquid behavior for $x>~0.7.$ For $x=0.8,$ the low-temperature physical properties can be expressed as $\ensuremath{\rho}(T)=\ensuremath{\rho}(0)[1\ensuremath{-}{a(T/T}_{0})],$ $C(T)/T=\ensuremath{-}{(R/bT}_{0})\mathrm{ln}{(T/b}^{\ensuremath{'}}{T}_{0})$ or ${T}^{\ensuremath{-}1+\ensuremath{\lambda}}$ (\ensuremath{\lambda}=0.82), and $\ensuremath{\chi}(T)=\ensuremath{\chi}(0)[1\ensuremath{-}{c(T/T}_{0}{)}^{1/2}]$ where $\ensuremath{-}a,b,{b}^{\ensuremath{'}},$ and c are positive constants and ${T}_{0}\ensuremath{\approx}30\mathrm{K}.$ In addition, we observed concentration x-dependent features in the specific heat and magnetic susceptibility that appears to be due to magnetic order and extrapolate linearly to $T=0\mathrm{K}$ at $x\ensuremath{\approx}0.7.$