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Berlin 2012 – scientific programme

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TT: Fachverband Tiefe Temperaturen

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

TT 33.38: Poster

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

Preparation and characterization of LaAlO3/SrTiO3 heterostructures — •Ahmed Sleem1,2, Dirk Fuchs1, Rudolf Schneider1, and Hilbert von Löhneysen1,31Karlsruher Institut für Technologie, Institut für Festkörperphysik, 76021 Karlsruhe, Germany — 2Karlsruher Institut für Technologie, Fakultät für Physik, 76031 Karlsruhe, Germany — 3Karlsruher Institut für Technologie, Physikalisches Institut, 76031 Karlsruhe, Germany

Thin films of LaAlO3 were grown epitaxially by pulsed laser deposition on TiO2 terminated <001> oriented SrTiO3 substrates. The deposition parameters, i. e., substrate temperature TS, oxygen partial pressure P(O2) and the laser fluence F on the target were optimized with respect to the interface conductivity of the heterostructure. For this purpose, contacts through the LaAlO3 layer were prepared by argon ion-etching down to the interface and subsequent hole-filling with Pt or direct bonding of Al-wires. Metallic behavior down to T = 4.2 K was found only in a very narrow range of TS, F and P(O2). Experimental results with respect to the characterization of the surface and substrate termination, the structural properties and interface conductivity obtained by atomic force microscopy, x-ray diffraction and high resolution electron microscopy, and resistivity measurements, respectively, will be presented and discussed.

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