Dresden 2017 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 14: Superconductivity: Tunnelling, Josephson Junctions, SQUIDs 1
TT 14.5: Talk
Monday, March 20, 2017, 16:00–16:15, HSZ 201
Polarization dependence of the tunnel current in superconductor-ferroelectric-superconductor junctions — •Anke Sander, Victor Rouco, Laura Begon-Lours, Sophie Collin, Stephane Fusil, Jacobo Santamaría, Vincent Garcia, and Javier E. Villegas — Unité Mixte de Physique, CNRS, Thales, Univ. Paris-Sud, Université Paris Saclay, 91767 Palaiseau, France
In tunnel junctions with a ferroelectric barrier, a large resistance variation is observed upon ferroelectric switching, which can be induced by a short voltage pulse. Known as electroresistance, this phenomenon is connected to the interfacial screening of the electric field generated by the ferroelectric in the junction’s electrodes.
Usually realized in junctions with normal-metal electrodes, here we experimentally investigate these effects in junctions that combine the ferroelectric BiFeO3 and different types of superconducting electrodes. Using piezoresponse force microscopy and electrical measurements, we find an unusual temperature dependence of the electroresistance, which reaches up to 104% .The effects are discussed in terms of the interface charge-carrier depletion produced in the superconducting electrodes.