Curie temperatures of the concentrated and diluted Kondo-lattice model as a possible candidate to describe magnetic semiconductors and metals

We present a theory to model carrier mediated ferromagnetism in concentrated or diluted local moment systems. The electronic subsystem of the Kondo lattice model (KLM) is described by a combined equation of motion (EOM)/coherent potential approximation (CPA) method. Doing this we can calculate the f...

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Bibliographic Details
Published in:Physica Status Solidi (b) 2011-09, Vol.248 (9), p.2192-2202
Main Authors: Stier, M., Nolting, W.
Format: Article
Language:English
Subjects:
Coherent potential approximation
Condensed matter: electronic structure, electrical, magnetic, and optical properties
correlated electrons
Curie temperature
diluted magnetic semiconductors
Dilution
Electronics
Equations of motion
Exact sciences and technology
Free energy
Kondo-lattice model
Magnetic properties and materials
Magnetic semiconductors
Magnetically ordered materials: other intrinsic properties
magnetism
Magnetization
Mathematical models
Physics
Studies of specific magnetic materials
Valence fluctuation, kondo lattice, and heavy-fermion phenomena
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Summary:We present a theory to model carrier mediated ferromagnetism in concentrated or diluted local moment systems. The electronic subsystem of the Kondo lattice model (KLM) is described by a combined equation of motion (EOM)/coherent potential approximation (CPA) method. Doing this we can calculate the free energy of the system and its minimum according to the magnetization of the local moments. Thus, also the Curie temperature can be determined and its dependence on important model parameters. We get qualitative agreement with the Curie temperatures' experimental values of Ga1–xMnxAs for a proper hole density.
ISSN:0370-1972
1521-3951
1521-3951
DOI:10.1002/pssb.201147059