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Article Dans Une Revue Journal of Magnetism and Magnetic Materials Année : 2014

Effect of anisotropy in the S=1 underscreened Kondo lattice

Résumé

We study the effect of crystal field anisotropy in the underscreened S = 1 Kondo lattice model. Starting from the two orbital Anderson lattice model and including a local anisotropy term, we show, through Schrieffer-Wolff transformation, that local anisotropy is equivalent to an anisotropic Kondo interaction (J = J ⊥). The competition and coexistence between ferromagnetism and Kondo effect in this effective model is studied within a generalized mean-field approximation. Several regimes are obtained, depending on the parameters, exhibiting or not coexistence of magnetic order and Kondo effect. Particularly, we show that a re-entrant Kondo phase at low temperature can be obtained. We are also able to describe phases where the Kondo temperature is smaller than the Curie temperature (TK < TC). We propose that some aspects of uranium and neptunium compounds that present coexistence of Kondo effect and ferromagnetism, can be understood within this model.
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Dates et versions

hal-01430863 , version 1 (10-01-2017)

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Christopher Thomas, Acirete S. da Rosa Simões, Claudine S Lacroix, José S Roberto Iglesias, Bernard S Coqblin. Effect of anisotropy in the S=1 underscreened Kondo lattice. Journal of Magnetism and Magnetic Materials, 2014, 372, pp.247 - 252. ⟨10.1016/j.jmmm.2014.07.028⟩. ⟨hal-01430863⟩
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