Abstract
CeRu2Si2 is a heavy-fermion compound andCeNi2Si2 is a mixed-valence compound. We measured theLIII absorption spectra of CeRu2-xNixSi2 (x = 0, 0.2, 0.4, 0.8, 0.9, 1.0, 1.1, 1.4, 1.6, and 2.0) at 16, 50, 100,200, and 300 K. The linear coefficient of the specific heat γ ofCeRu2-xNixSi2 is enhanced rapidly for Ce valence v<3.08. The structure of CeRu2-xNixSi2 is consistentwith the tetragonal space group I4/mmm. There is no criticallattice constant c separating the strongly mixed-valence regimefrom the heavy-fermion regime for CeRu2-xNixSi2. Thevalue of the lattice constant c is almost a linear function ofx, whereas there is a deviation from linearity for the values ofthe lattice constant a when x<0.4. Judging by the LIIIx-ray absorption spectra of CeRu2-xNixSi2 andCeRu2Si2-xGex, the evolution from heavy-fermion tomixed-valence behaviour might be due just to the hybridizationbetween the Ce 4f-electron wave function and the sp wavefunction of Ru.
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