Spin Glass and antiferromagnetism in Kondo lattice disordered systems

Details Spin Glass and antiferromagnetism in Kondo lattice disordered systems Spin Glass and antiferromagnetism in Kondo lattice disordered systems

2003-07-04

arxiv.org/abs/cond-mat/0307111v1

Physics

Condensed Matter

Strongly Correlated Electrons

7 pages, 1 figure, submitted to EPJB

Scientific paper

10.1140/epjb/e2003-00243-y

The competition between spin glass (SG), antiferromagnetism (AF) and Kondo effect is studied here in a model which consists of two Kondo sublattices with a gaussian random interaction between spins in differents sublattices with an antiferromagnetic mean Jo and standard deviation J. In the present approach there is no hopping of the conduction electrons between the sublattices and only spins in different sublattices can interact. The problem is formulated in the path integral formalism where the spin operators are expressed as bilinear combinations of Grassmann fields which can be solved at mean field level within the static approximation and the replica symmetry ansatz. The obtained phase diagram shows the sequence of phases SG, AF and Kondo state for increasing Kondo coupling. This sequence agrees qualitatively with experimental data of the Ce_{2} Au_{1-x} Co_{x} Si_{3} compound.

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