Spin Glass and Ferromagnetism in Kondo lattices compounds

Abstract

The Kondo lattice model has been analyzed in the presence of a random inter-site interaction among localized spins with non zero mean Jo and standard deviation J. Following the same framework previously introduced by us, the problem is formulated in the path integral formalism where the spin operators are expressed as bilinear combinations of Grassmann fields. The static approximation and the replica symmetry ansatz have allowed us to solve the problem at a mean field level. The resulting phase diagram displays several phase transitions among a ferromagnetically ordered region,a spin glass one, a mixed phase and a Kondo state depending on Jo, J and its relation with the Kondo interaction coupling Jk. These results could be used to address part of the experimental data for the CeNi_{1-x}Cu_x compound, when x =< 0.8.

7 pages, 2 figures. accepted for publication in The European Physical Journal B

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• Doniach diagram for ordered, disordered and underscreened Kondo lattices
• Quantum critical point in the spin glass-antiferromagnetism competition for fermionic Ising Models
• A theoretical study of the cluster glass-Kondo-magnetic disordered alloys
• Fermionic van Hemmen Spin Glass Model with a Transverse Field
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