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 Hoffmann² — ¹IFW 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.