We have measured the static magnetic susceptibility $\chi$ of the compound $\mathrm{Ce}{\left({\mathrm{Cu}}_{1-x}{\mathrm{Ag}}_x\right)}_6$ for $x\le 0.1$ from 2.4 to 300 K and the specific heat of one sample ($x=0.1\mathrm{}$) from 0.6 to 30 K. The effect of Ag substitution is to markedly increase both $\chi$ and the Sommerfeld constant $\gamma$ at low temperatures. $\gamma$ for the $x=0.1\mathrm{}$ sample is temperature dependent and reaches the value 2.1 J/mole ${\mathrm{K}}^2$ at 0.6 K, extrapolating to approximately 2.8 J/mole ${\mathrm{K}}^2$ at $T=0\mathrm{}$ K. These results can be analyzed in terms of a twofold decrease in the value of the Kondo temperature $T_K$ with 10% Ag substitution.

• Received 22 June 1987

DOI:https://doi.org/10.1103/PhysRevB.36.4086