Abstract
Magnetic and resistivity measurements performed on the $\mathrm{Ce}{\mathrm{Ni}}_{x}{\mathrm{Pt}}_{1\ensuremath{-}x}$ compounds show that this system is one of the best examples of a ferromagnetic dense Kondo system in which Ruderman-Kittel-Kasuya-Yosida exchange interactions compete with the Kondo effect. The variations of the Curie temperature ${T}_{C}$ and of the Kondo temperature ${T}_{K}$ as a function of the Ni content are in qualitative agreement with those calculated as a function of the product $|\ensuremath{\Gamma}n({E}_{F})|$ in the Kondo lattice model, where $\ensuremath{\Gamma}(<0)$ is the coupling constant between the $4f$ shell and the conduction band. The increase of $|\ensuremath{\Gamma}n({E}_{F})|$ as a function of the Ni content is suggested to be mainly due to the decrease of the separation between the $f$ level and the Fermi level.
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