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Phase diagrams of Kondo alloys

Abstract : 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 CexLa1 xPt2Si2, CexLa1 xNi2Ge2, CexLa1 xRu2Si2, CexLa1 xPd2Si2, or CexLa1 xCu2Ge2.
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https://hal.archives-ouvertes.fr/hal-03109515
Contributor : Bishal Poudel <>
Submitted on : Wednesday, January 13, 2021 - 6:34:03 PM
Last modification on : Tuesday, January 19, 2021 - 8:17:42 AM

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

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