Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2011-04-21
Physics
Condensed Matter
Strongly Correlated Electrons
11 pages, 10 figures, refereed version of Physica Status Solidi b (http://dx.doi.org/10.1002/pssb.201147059)
Scientific paper
10.1002/pssb.201147059
We present a theory to model carrier mediated ferromagnetism in concentrated or diluted local moment systems. The electronic subsystem of the Kondo lattice model is described by a combined equation of motion / coherent potential approximation 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 Ga$_{1-x}$Mn$_x$As for a proper hole density.
Nolting Wolfgang
Stier Martin
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