Abstract
The coexistence of Kondo effect and ferromagnetic order has been observed inmany uranium and neptunium compounds such as UTe or Np2PdGa3. This coexistence canbe described within the underscreened Anderson lattice model with two f-electrons and S = 1spins on each site. After performing the Schrieffer-Wolff transformation on this model, we haveobtained an effective Hamiltonian with a f-band term in addition to the Kondo interactionfor S = 1 spins. The results indicate a coexistence of Kondo effect and ferromagnetic order,with different relative values of the Kondo TK and Curie TC temperatures. We emphasize hereespecially the case TK < TC where there is a Kondo behavior below TC and a clear decrease ofthe magnetization below TK. Such a behavior has been observed in the magnetization curvesof NpNiSi2 at low temperatures.
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