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Dresden 2011 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 44: Poster Session Correlated Electrons

TT 44.46: Poster

Thursday, March 17, 2011, 10:00–13:00, P1

Investigation of the Electronic Structure and the Role of Cationic Disorder in LaAlO3 - SrTiO3 Heterointerfaces by Soft X-ray Spectroscopy — •Andreas Koitzsch1, Johannes Ocker1, Martin Knupfer1, Martina Dekker1, Kathrin Dörr1, Bernd Büchner1, and Patrick Hoffmann21IFW Dresden, P. O. Box 270116, 01171 Dresden, Germany — 2Hemlholtz-Zentrum Berlin, Albert-Einstein-Str. 15, 12489 Berlin, Germany

The structure of LaAlO3 / SrTiO3 interfaces is under intense discussion due to the appearance of metallic conductivity, magnetism and superconductivity. The most important phenomena supposed to be crucial for the observed effects are the polar catastrophe, the formation of oxygen vacancies and the intermixing of La and Sr at the interface. However, at present there is no consensus about the driving force of the unusual properties. Here we apply on and off resonant photoemission to differently prepared LaAlO3 / SrTiO3 interfaces. In particular we study the behavior of the valence band, the Ti 2p, Sr 3d and La 4d lines. Significant differences are found as a function of sample treatment and photon energy. A model of the interface structure is developed.

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