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Article Dans Une Revue Journal of Magnetism and Magnetic Materials Année : 2021

Phase diagrams of Kondo alloys

Résumé

We analyze the ground state phase diagrams of the Kondo alloy model (KAM) as a function of Kondo coupling (JK), electronic band filling (nc) and magnetic impurity concentration (x). We use DMFT/CPA method to treat the disorder and the inter-site electronic exchange correlations along with mean-field (MF) approximations to decouple the Kondo interaction. Here, we generalize “Doniach-like” phase diagrams of the periodic Kondo lattice ( x = 1) to Kondo alloys. We consider the competition between the paramagnetic Kondo phase (K) and purely ferromagnetic (F) or staggered antiferromagnetic (AF) ordered phases. Our phase diagrams are consistent with various experimentally obtained phase diagrams for alloys like Cex La1-x Pt2Si2, Cex La1-x Ni2Ge2, Cex La1-x Ru2Si2, CexLa1-xPd2Si2, or CexLa1-xCu2Ge2.
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Dates et versions

hal-03109515 , version 1 (13-01-2021)

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Bishal Poudel, Gertrud Zwicknagl, Claudine Lacroix, Sébastien Burdin. Phase diagrams of Kondo alloys. Journal of Magnetism and Magnetic Materials, 2021, 520 (167405), ⟨10.1016/j.jmmm.2020.167405⟩. ⟨hal-03109515⟩
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