Transport and magnetic properties of Ce$_{1-x}$La$_x$Cu$_2$Ge$_2$ single crystals*

We present magnetic-susceptibility, resistivity, heat-capacity, and thermoelectric power measurements on single crystals of La-diluted Kondo lattice CeCu$_2$Ge$_2$. The results of these measurements show that the antiferromagnetic temperature $T_N$ is suppressed in almost linear fashion with increasing of La concentration. The magnetic order was observed from x=0 ($T_N$=4.15 K) up to x=0.80 where $T_N$=0.56 K with 0.38 K being the lowest base temperature in our measurements. The characteristic Kondo temperature was found to decrease from 4 K to 1 K rather slowly. For the lowest concentrations of La, the heat capacity was shown to follow the prediction of the Kondo-impurity model.