Phase transitions and non-Fermi-liquid behavior inUCu5−xPdxat low temperatures

We report on measurements of the specific heat C and susceptibility $\chi$ on ${\mathrm{UCu}}_{5-x}{\mathrm{Pd}}_x\hspace{0.5em}(x=0,1,1.25,1.5,2).$ For $1<~x<~1.5,$ the results suggest that non-Fermi-liquid behavior, i.e., a divergence of $C/T$ and $\chi$ towards low temperatures, gives way to spin-glass freezing for $x=1\mathrm{}$ and $x=1.5,$ whereas no indication of a magnetically ordered ground state is observed for $x=1.25\mathrm{}$ down to $30\hspace{0.5em}\mathrm{mK}.$ A description based on the model of the Griffiths phase yields exponents $\lambda$ determined from $C/T$ and $\chi ,$ which are compatible with each other.