Dresden 2006 – wissenschaftliches Programm

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MA: Magnetismus

MA 20: Poster: Films(1-36) Transp(37-56) Ex.Bias(57-67) Spindyn(68-80) Micromag(81-95) Particle(96-109) Imag.+Surface(110-113) Spinelectr(114-122) Theory+Micromag(123-131) Spinstr+Aniso(132-142) MagMat(143-156) Meas(157,158) MolMag+Kondo(159-162) Postdead(163-)

MA 20.123: Poster

Dienstag, 28. März 2006, 15:15–19:15, P1

Ferromagnetism in desordered Kondo-lattice — •Vadym Bryksa and Wolfgang Nolting — Institut fur Physik, Humbolt-Univasitat zu Berlin, 12489 Berlin, Germany

For modeling the magnetic and electronic properties of diluted magnetic semiconductors (DMS), we use the Kondo-lattice model in combination with an effective Heisenberg model. The theory is based on a previous developed selfenergy approach with an additional CPA-like treatment of the disorder in the local moment system. We demonstrate the properties of the disordered ferromagnetic Kondo-lattice in terms of spectral densities and quasiparticle densities of states. The temperature and concentration dependence of the magnetic and electronic excitation spectrum of the diluted semiconductor will be worked out.