title: Effect of Gd doping and O deficiency on the Curie temperature of EuO.
abstract: 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 studied by means of density functional theory. For both defects, the Curie temperature is found to exhibit a distinct maximum as a function of the defect concentration. The existence of optimal defect concentrations is explained by the interplay of the on-site, RKKY, and superexchange contributions to the magnetism.
authors.affiliation: Institut für Physik, Universität Augsburg, 86135 Augsburg, Germany.
authors.forename: Nuttachai
authors.initials: N
authors.lastname: Jutong
authors.affiliation: Institut für Physik, Universität Augsburg, 86135 Augsburg, Germany.
authors.forename: Ulrich
authors.initials: U
authors.lastname: Eckern
authors.affiliation: Zentrum für elektronische Korrelationen und Magnetismus, Universität Augsburg, 86159 Augsburg, Germany.
authors.forename: Thomas
authors.initials: T
authors.lastname: Mairoser
authors.affiliation: KAUST, PSE Division, Thuwal 23955-6900, Kingdom of Saudi Arabia.
authors.forename: Udo
authors.initials: U
authors.lastname: Schwingenschlögl