Spin Glass and antiferromagnetism in Kondo lattice disordered systems

Abstract

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.

arXiv comment7 pages, 1 figure, submitted to EPJB

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Cited by in corpus (7)

• Spin Glass and ferromagnetism in disordered Cerium compounds
• Quantum Critical Point in the Spin Glass-Kondo Transition in Heavy Fermion Systems
• A van Hemmen-Kondo model for disordered strongly correlated electron systems
• Quantum critical point in the spin glass-antiferromagnetism competition in Kondo-lattice systems
• Doniach diagram for ordered, disordered and underscreened Kondo lattices
• Quantum critical point in the spin glass-antiferromagnetism competition for fermionic Ising Models
• The spin glass-antiferromagnetism competition in Kondo-lattice systems in the presence of a transverse applied magnetic field