We report results of electrical resistivity and thermopower measurements on the ${\mathrm{Ce}}_x{\mathrm{La}}_{1-x}{\mathrm{Cu}}_{2.05}{\mathrm{Si}}_2$ alloy system from 2 to 300 K. It was shown that regardless of various concentration regimes the characteristic temperature behaves in accordance with the Anderson impurity model. We have found evidence of the crystal electrical field contribution to the resistivity even for $x<\mathrm{}\mathrm{0.10.}\mathrm{}$ We conclude that the crystal field scheme does not change with concentration up to $x=1.\mathrm{}$ The thermopower data support such a conclusion. In the dilute region the disagreement from Fermi liquid behavior increases with increasing dilution. The position of this alloy system within Doniach’s diagram can give the explanation of this experimental fact. We also discuss the origin of the negative low-temperature thermopower in the concentrated region.

• Received 7 August 2000

DOI:https://doi.org/10.1103/PhysRevB.64.195106