Berlin 2012 – scientific programme

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TT: Fachverband Tiefe Temperaturen

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

TT 29.9: Talk

Wednesday, March 28, 2012, 17:30–17:45, H 2053

Andreev Reflexion studies on planar hybrid SNS-junctions based on 122-thin films — •Sebastian Döring¹, Stefan Schmidt¹, Frank Schmidl¹, Volker Tympel¹, Silvia Haindl², Fritz Kurth², Kazumasa Iida², Bernard Holzapfel², and Paul Seidel¹ — ¹Friedrich-Schiller-Universität Jena, Institur für Festkörperphysik, Helmholtzweg 5, 07745 Jena — ²IFW Dresden, Institut für metallische Werkstoffe, Helmholtzstraße 20, 01069 Dresden

To investigate the properties of iron-based superconductors, we prepared hybrid junctions in thin film technique [1]. Therefore two geometries were prepared, a planar SNS-junction and an edge junction. The base electrode was made of Ba(Fe_0.9Co_0.1)₂As₂ thin films [2], a sputtered gold layer acts as normal barrier for the planar junction and for the counter electrode we used the conventional superconductor lead. We measured the electrical properties of each electrode, as well as the junctions itself. To obtain information about the order parameter symmetry, we show the differential conductance and compare with different variations of an extended BTK-model. We will show differences and commonalities between the results of both junction geometries.

This work was partially supported by DFG under project nos. HA5934/3-1 and SE664/15-1, the EU under project no. FP7-283141 (IRONSEA) and the Landesgraduiertenförderung Thüringen.
S. Schmidt et al. APL. 97 (2010) 172504
K. Iida et al. SST 24 (2011) 125009