Regensburg 2016 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 17: Low-Dimensional Systems: Oxide Hetero-Interfaces
TT 17.3: Vortrag
Montag, 7. März 2016, 15:30–15:45, H22
Anisotropic transport in the two dimensional electron gas at oxide hetero-interfaces — •Roland Schäfer1, Dirk Fuchs1, Karsten Wolff1,2, Ahmed Sleem1,2, Richard Thelen3, Rudolf Schneider1, and Hilbert v. Löhneysen1,2 — 1Karlsruher Institut für Technologie, Institut für Festkörperphysik, 76021 Karlsruhe — 2Karlsruher Institut für Technologie, Physikalisches Institut, 76131 Karlsruhe — 3Karlsruher Institut für Technologie, Institut für Mikrostrukturtechnik, 76021 Karlsruhe
We observe a resistive transition to superconductivity in the two dimensional electron gas which forms at the interface of strontium titanate and lanthanum aluminate or amorphous aluminium oxide. Resistivity is measured on quadratic samples in van der Pauw geometry; the voltage drop resulting from current injected at two contacts on one side of the sample is probed at the opposite side by two further contacts. The two possible, orthogonal arrangements show distinct different behavior indicating strong anisotropy in the transport properties of the electron gas. The results will be discussed with respect to a reduced dimensionality of the superconducting condensate.