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TT: Fachverband Tiefe Temperaturen

TT 29: Superconductivity: Tunnelling, Josephson Junctions, SQUIDs 1

TT 29.8: Talk

Wednesday, March 28, 2012, 17:15–17:30, H 2053

Grain boundary junctions with Co-doped Ba-122 — •Stefan Schmidt¹, Sebastian Döring¹, Frank Schmidl¹, Fritz Kurth², Kazumasa Iida², Silvia Haindl², Bernhard Holzapfel², and Paul Seidel¹ — ¹Friedrich-Schiller-Universität Jena, Institut für Festkörperphysik, Helmholtzweg 5, 07743 Jena, Germany — ²IFW Dresden, Institut für metallische Werkstoffe, Helmholtzstrasse 20, 01069 Dresden, Germany

Josephson junctions are a strong tool to investigate fundamental superconducting properties, such as gap behaviour, dependencies from external fields and the order parameter symmetry. Finding secure values enables the possibility of theoretical descriptions to understand the physical processes within the new iron-based superconductors. The superconducting quantum interference device (SQUID) symmetry provides a phase-sensitive tool to examine flux behaviour in a very precise.

Based on Co-doped Ba(Fe_0.9Co_0.1)₂As₂ (Co:Ba-122) thin films produced via pulsed laser deposition (PLD) on SrTiO₃ bicrystal substrates (mismatch angles from 9^∘ to 36^∘), we manufactured grain boundary junctions by using photolithography and ion beam etching. Based on the grain boundary junctions, SQUID structures can be realized.

We present first measurements on Co:Ba-122 grain boundary Josephson junctions and their temperature dependence.

This work was partially supported by the EU within project IRON-SEA, no. FP7-283141 and the Landesgraduiertenförderung Thüringen.