Dresden 2014 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 79: Correlated Electrons - Poster Session
TT 79.59: Poster
Mittwoch, 2. April 2014, 15:00–19:00, P2
Effect of Gd doping and O deficiency on the Curie temperature of EuO — •Nuttachai Jutong1, Thomas Mairoser2, Ulrich Eckern1, and Udo Schwingenschlögl3 — 1Institut für Physik, Universität Augsburg, 86135 Augsburg, Germany — 2Zentrum für elektronische Korrelationen und Magnetismus, Universität Augsburg, 86159 Augsburg, Germany — 3KAUST, PSE Division, Thuwal 23955-6900, Kingdom of Saudi Arabia
The effect of Gd doping and O deficiency on the electronic structure, exchange interaction, and Curie temperature of EuO in the cubic and tetragonal phases is modeled by means of density functional theory. We observe a maximum in the Curie temperature around 6.25% Gd doping, originating from a combination of f-d hopping and indirect exchange. However, the effect is suppressed at high doping. An increased Curie temperature is found in the case of O deficiency and is attributed to a double exchange mechanism, which is suppressed in the tetragonal phase due to Jahn-Teller distortions.