Berlin 2012 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 33: Superconductivity, Measuring Devices, Matter at Low Temperature: Poster Session

TT 33.39: Poster

Wednesday, March 28, 2012, 15:00–19:00, Poster B

Torque magnetometry on SrTiO₃-LaAlO₃ heterostructures — •Matthias Brasse¹, Rainer Jany², Marc A. Wilde¹, and Dirk Grundler¹ — ¹Lehrstuhl für Physik funktionaler Schichtsysteme, Technische Universität München, Physik Department, James-Franck-Str.1, D-85747 Garching b. München, Germany — ²Experimentalphysik VI, Institut für Physik, Universität Augsburg

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 shows a metallic phase and coexistence of superconductivity and magnetism at low temperatures. To explore the nature of the magnetic phase we use highly sensitive micromechanical torque magnetometry. This technique allows us to address different phenomena such as the de Haas-van Alphen effect, dia- and paramagnetism in superconducting states as well as magnetic hysteresis and anisotropy in case of correlated magnetism. Methods and results of ongoing measurements will be presented. We thank R. Jany and the group of J. Mannhart from the University of Augsburg for sample preparation. This work is supported by the DFG via TRR 80.