Berlin 2012 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 29: Superconductivity: Tunnelling, Josephson Junctions, SQUIDs 1
TT 29.8: Vortrag
Mittwoch, 28. März 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(Fe0.9Co0.1)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.