Oxygen vacancies at titanate interfaces: Two-dimensional magnetism and orbital reconstruction

N. Pavlenko,1,2,* T. Kopp,1 E. Y. Tsymbal,3 J. Mannhart,4 and G. A. Sawatzky5 1Center for Electronic Correlations and Magnetism, Experimental Physics VI, Institute of Physics, University of Augsburg, 86135 Augsburg, Germany 2Center for Electronic Correlations and Magnetism, Theoretical Physics III, Institute of Physics, University of Augsburg, 86135 Augsburg, Germany 3Department of Physics and Astronomy, Nebraska Center for Materials and Nanoscience, University of Nebraska, Lincoln, Nebraska 68588-0299, USA 4Max Planck Institute for Solid State Research, 70569 Stuttgart, Germany 5Department of Physics and Astronomy, University of British Columbia, Vancouver, Canada V6T1Z1 (Received 20 April 2012; revised manuscript received 20 July 2012; published 22 August 2012)