Berlin 2008 – wissenschaftliches Programm

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SYNF: Symposium Ferroic materials and novel functionalities

SYNF 1: Ferroic materials and novel functionalities I

SYNF 1.3: Vortrag

Dienstag, 26. Februar 2008, 11:00–11:15, A 151

electronic structure induced reconstruction and magnetic ordering at the LaAlO3/SrTiO3 interface — •zhingcheng zhong and paul kelly — Faculty of Science and Technology and MESA+ institute for Nanotechnology, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands

The finding of a high mobility electron gas at the interface between two large band gap insulators LaAlO3 and SrTiO3 led to the observation of interface magnetic ordering and, more recently superconductivity. We study this interface using density functional theory (LDA and LDA+U), taking into account the possibility of interface structural relaxation, charge and spin ordering. We find that charge, orbital and magnetic ordering can occur in a quarter-filled band system. The lowest energy configuration is a charge-ordered antiferromagnetic insulator. At a slightly higher energy, we find a charge-ordered ferromagnetic insulator with a smaller band gap. We discuss various scenarios for explaining the experimental observations.