Regensburg 2007 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 15: Poster:ThinFilms(1-33),Transp.(34-49),ExchBias(50-56),
Spindynamics(57-70),Micro-nanostr.Mat.(71-82),
Particles/Clust.(83-88), Mag.Imag./Surface(89-96),
Spinelectronics(97-109), Theory/Micromag.(110-116),
Spinstruct/Phasetr.(117-128),Magn.Mat.(129-139),
Aniso.+Measuring(140-145), MolMag.(146-152),
MSMA(153-156)

MA 15.110: Poster

Dienstag, 27. März 2007, 15:00–19:00, Poster A

Ferromagnetic multiband Kondo lattice model — •Anand Sharma and Wolfgang Nolting — Institut fuer Physik, Humboldt Universitaet zu Berlin, Lehrstuhl Festkoerpertheorie, Newtonstr.15, D-12489, Berlin.

The spin exchange interaction between the itinerant electrons and localized moments on a periodic lattice, studied within the so-called Kondo lattice model (KLM), is considered for multiband situation where the hopping integral is a matrix in general. The modified RKKY theory (PRB 65, 144419 (2002)), wherein one can map such a model onto an effective Heisenberg-like system, is extended to a two band situation with a finite bandwidth and hybridization on a simple cubic lattice. As an input for the evaluation of the effective exchange integrals, one requires the multiband electronic self energy which is taken from an earlier proposed ansatz (PSSB 243, 641 (2006)). Using the above procedure, we determine the magnetic properties of the system like Curie temperature (within Random Phase Approximation) while calculating the chemical potential and magnetization within a self consistent cycle for various values of system parameters. The results are discussed in detail and the model is also considered for the study of the electronic and magnetic properties of real materials like GdN.