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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 20.114: Poster

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

Magnetic and chemical disorder in diluted magnetic semiconductors — •Martin Mücke and Wolfgang Nolting — Institut für Physik, Humboldt-Universtät zu Berlin, 12489 Berlin, Germany

We use the Kondo-lattice model for calculating the magnetic properties of diluted magnetic semiconductors. On the basis of recently developed many-body theories we determine the influence of magnetic moment concentration x on the quasiparticle density of states and the magnetic phase diagram for the ground state at T=0 K. The disorder is treated by applying the coherent potential approximation to our model. We estimate the dependence of Curie temperature on moment concentration x and the number of itinerant charge carriers n, which are indirectly coupled to the localized magnetic moments. The results show, that ferromagnetism is possible for all moment concentrations, but charge carrier compensation is necessary for getting sufficiently high Curie temperatures.