Abstract
The competition between singlet Fermi liquids and magnetic states was theoretically investigated in Kondo lattices. The RKKY exchange interaction was treated in the mean field approximation, while the Kondo effect was taken into account in the next divergent approximation, or in the approximation that terms of the order of 1/ N 2 are included in the 1/ N -expansion method, N being the degeneracy of localized levels. The theory can explain saturated magnetization of CeNi x Pt 1- x as a function of Ni content, x , by assuming that the Kondo temperature depends linearly on x .
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