Anomalous Behavior on Specific Heat and Thermoelectric Power in Wide Range of Temperatures in CeNi2(Ge1-xSix)2

We present magnetic specific heat C m and thermoelectric power S for CeNi 2 (Ge 1- x Si x ) 2 ( x = 0–0.4) in a wide range of temperatures above 1 to 300 K. Both C m and S show a characteristic broad peak around 100–150 K due to the Kondo effect with high Kondo temperature which is comparable to the crystalline electric field. On the other hand, C m / T and S / T synchronously increase logarithmically at low temperatures on cooling for all x investigated. The anomalous temperature dependence both in C m / T and S / T at low temperatures is interpreted as non-Fermi-liquid behavior due to the proximity to the quantum critical point for x ≤0.1, and due to Kondo disorder for x ≥0.3.