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Thermal properties of various Kondo ground states in the heavy-fermion system CeNi1−xCoxGe2

We report results of the specific heat of the heavy-fermion compounds of the alloying series CeNi1−xCoxGe2. With increasing x, hybridization between the localized 4f and conduction band electrons is enhanced. The magnetic order observed for the x = 0 composition is completely suppressed at a critical concentration of xc = 0.3, yielding Fermi-liquid behaviour for x>0.3. We observe significant deviations from the Fermi-liquid behaviour at xc = 0.3. Anomalies found in the specific heat are well explained by the Kondo model for a degenerate impurity spin J = 1/2,3/2, and 5/2 in the Coqblin–Schrieffer limit for the Co concentration ranges of , , and , respectively.