Dresden 2003 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 11: Postersitzung II (Metall-Isolator-Überg
änge, Phasenüberg
änge in Quantensystemen, Theorie: Systeme korrelierter Elektronen)

TT 11.1: Poster

Dienstag, 25. März 2003, 14:30–19:00, P2c, P2d

Modelling the metal-insulator transition in Eu-rich EuO — •Peter Sinjukow and Wolfgang Nolting — Lehrstuhl Festkörpertheorie, Institut für Physik, Humboldt-Universität zu Berlin, Invalidenstraße 110, 10115 Berlin, Germany

A Hamiltonian for calculating electronic properties of Eu-rich EuO is proposed, which additionally to the conduction band and the localized Eu spins (Kondo-lattice model) describes electronic impurity levels of oxygen vacancies (He-model). Our results on the electrical resistivity in dependence on the vacancy concentration reproduce well the observed orders of magnitude of the spectacular temperature-driven metal-insulator transitions of different experimental samples of Eu-rich EuO. The metal-insulator transition is interpreted in terms of temperature-dependent quasiparticle densities of states.