Abstract
The metamagnetic behavior of CeRu 2 Si 2 and the non Fermi-liquid behavior of CeNi 2 Ge 2 are described by the periodic Coqblin-Schrieffer model with anisotropic c - f exchange interaction in the mean-field theory. Only the Kramers doublet of M J =±5/2 for the 4 f states of Ce ions is considered, for the case of which the density of quasi-particle states has singularity of | ω| -1/2 around the effective f -level energy. In the asymmetric case applicable to CeRu 2 Si 2 , the chemical potential reaches the singularity at a finite magnetic field, at which the magnetization shows a metamagnetic-like increase. On the other hand, in the symmetric case applicable to CeNi 2 Ge 2 , the chemical potential is on the singularity at zero magnetic field, and non-Fermi-liquid-like behaviors emerge in the susceptibility and the specific heat.
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