Transport properties of (Ce_1-xR_x)Ru₂ (R La, Nd)

We have investigated electrical resistivity and thermoelectric power of a moderately heavy fermion compound CeRu₂, and its alloys (Ce_1-xR_x)Ru₂ (0 ≤ x ≤ 1; R La, Nd) in the temperature range between 2 and 300 K. The effect of substitution for both pseudobinary alloys gives the striking similarity on the thermoelectric power except for the lowest temperature properties. With increasing R concentration for x ≤ 0.25, a pronounced positive peak at 80 K with the value of 5.5 μV/K for pure CeRu₂ on the thermoelectric power is shifted towards the higher temperatures. This tendency is roughly in accordance with the shift of the starting temperature of the marked saturation on the electrical resistivity, and seems to be correlated with the decrease in the T²-coefficient in the low temperature range.