Regensburg 2004 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 24: Postersitzung III: Korrelierte Elektronen, ”Orbital Physics”

TT 24.42: Poster

Mittwoch, 10. März 2004, 14:30–19:00, Poster A

Metal-Insulator transitions driven by magnetic field in half-doped manganites — •Horacio Aliaga and Dieter Vollhardt — Institut fuer Physik, Universitaet Augsburg D-86135, Germany

We study the first order transition between an antiferromagnetic (AF) charge-ordered (CO) insulator to a ferromagnetic (FM) metal under external applied magnetic field. The temperature variation of the charge gap and magnetization as a function of temperature for different magnetic fields are calculated using a model that considers the competition between double exchange (DE), super exchange (SE) and electron-phonon interactions. We show a comparison to transport and magnetization experiments in related compounds.