Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 72: Poster Session: Correlated Electrons
TT 72.69: Poster
Mittwoch, 14. März 2018, 15:00–19:00, Poster B
Resistance peak at the superconducting transition of SrTiO3/Al2O3−x-heterostructures — •Daniel Arnold, Roland Schäfer, Dirk Fuchs, and Karsten Wolff — Karlsruhe Institute of Technology, Institute for Solid State Physics
When an anisotropic system undergoes a superconducting transition the resistance is often peaking before it drops to zero. This effect is well documented for low- and high-Tc materials.
We have studied the resistive transition in the superconducting interface of (001)-oriented SrTiO3 and Al2O3−x as a function of temperature and magnetic field using a Van-der-Pauw sample geometry. Our sample shows a distinct difference for the two orthogonal directions of current flow indicating a preferential direction for supercurrents. In one of the direction an especially large peak effect is present.
We discuss our experimental data by comparing it to the results of numerical simulations and analytical calculations.