Stier M, Henning S, Nolting W. The ground state phase diagram of the diluted ferromagnetic Kondo-lattice model.
JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2011;
23:276006. [PMID:
21694439 DOI:
10.1088/0953-8984/23/27/276006]
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Abstract
We investigate the existence of several (anti-)ferromagnetic phases in the diluted ferromagnetic Kondo-lattice model, i.e. ferromagnetic coupling of local moment and electron spin. To do this we use a coherent potential approximation (CPA) with a dynamical alloy analogy. For the CPA we need effective potentials, which we obtain first from a mean-field approximation. To improve this treatment we use in the next step a more appropriate moment conserving decoupling approach and compare the two methods. The different magnetic phases are modeled by defining two magnetic sub-lattices. As a result we present zero-temperature phase diagrams according to the important model parameters and different dilutions.
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