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TT: Fachverband Tiefe Temperaturen

TT 44: Poster Session Correlated Electrons

TT 44.47: Poster

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

Design and realization of a torque magnetometer for magnetization studies on LaAlO₃-SrTiO₃ interfaces — •Matthias Brasse, Marc A. Wilde, and Dirk Grundler — Lehrstuhl für Physik funktionaler Schichtsysteme, Technische Universität München, Physik Department, James-Franck-Str.1, D-85747 Garching b. München, Germany

Two-dimensional electron systems (2-DESs) have been found to form at the interface between the otherwise insulating oxides LaAlO₃ and SrTiO₃. The strongly correlated electron system show metallic and superconducting phases. The magnetic properties of the 2-DESs interface are under debate. We intend to use highly sensitive micromechanical torque magnetometry to measure the magnetization of correlated electron states in the 2-DESs formed at the interface between SrTiO₃ and LaAlO₃. This will allow us to address different phenomena such as the de Haas-van Alphen effect, dia- and paramagnetism in superconducting states, spontaneous magnetization in case of correlated magnetism as well as magnetic hysteresis and anisotropy. Methods and results of ongoing measurements will be presented. We thank S. Thiel and the group of J. Mannhart from the University of Augsburg for sample preparation. This work is supported by the DFG via TRR 80.