Kondo effect in CexLa1-xCu2.05Si intermetallics

The magnetic susceptibility and susceptibility anisotropy of the quasibinary alloy system ${\mathrm{Ce}}_{x}{\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Cu}}_{2.05}{\mathrm{Si}}_{2}$ have been studied for low concentration of Ce ions. The single-ion description is found to be valid for $xl~0.09.$ The experimental results are discussed in terms of the degenerate Coqblin-Schrieffer model with a crystalline electric field splitting \ensuremath{\Delta}\ensuremath{\simeq}330 K. The properties of the model, obtained by combining the lowest-order scaling and the perturbation theory, provide a satisfactory description of the experimental data down to 30 K. The experimental results between 20 K and 2 K are explained by the exact solution of the Kondo model for an effective doublet.