Berlin 2012 – scientific programme

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MA: Fachverband Magnetismus

MA 5: Spin Structures and Magnetic Phase Transitions

MA 5.7: Talk

Monday, March 26, 2012, 11:15–11:30, H 0112

Magnetic phase diagram of Eu_1−xGd_xS — •Roman Rausch¹, Wolfgang Nolting², and Michael Potthoff¹ — ¹I. Institut für Theoretische Physik, Universität Hamburg — ²Festkörpertheorie, Institut für Physik, Humboldt-Universität Berlin

We present self-consistent RKKY calculations of the critical temperatures of the antiferromagnetic phases within the pure Kondo-lattice model (sc and fcc lattices). Extending the results to chemical and magnetic disorder, we are able to calculate the phases of the concentrated spin system Eu_1−xGd_xS which agree well with the experiment. This substance also shows a spin-glass phase whose origin is briefly discussed from a proposed microscopic principle.