Volume 84, Number 2, October 2008
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||10 September 2008|
Electronic-structureinduced reconstruction and magnetic ordering at the LaAlO3|SrTiO3 interface
Faculty of Science and Technology and MESA+ Institute for Nanotechnology, University of Twente P.O. Box 217, 7500 AE Enschede, The Netherlands
Accepted: 1 September 2008
Using local density approximation (LDA) calculations we predict GdFeO3-like rotation of TiO6 octahedra at the n-type interface between LaAlO3 and SrTiO3. This results in a narrowing of the Ti d bandwidth by 1/3 so that LDA calculations predict an antiferromagnetic, charge- and spin-ordered ground state for very modest values of U. Recent experimental evidence for magnetic interface ordering may be understood in terms of the close proximity of an antiferromagnetic insulating ground state to a ferromagnetic metallic excited state.
PACS: 75.70.Cn – Magnetic properties of interfaces (multilayers, superlattices, heterostructures) / 73.20.-r – Electron states at surfaces and interfaces / 68.35.Ct – Interface structure and roughness
© EPLA, 2008
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