Regensburg 2013 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 12: Poster Session Superconductivity
TT 12.42: Poster
Montag, 11. März 2013, 15:00–19:00, Poster D
Conductance spectra investigations of ironarsenide superconductor in planar junctions — •Sandra Gottwals1, Sebastian Döring1, Stefan Schmidt1, Noor Ali Hasan1, Frank Schmidl1, Fritz Kurth2, Kazumasa Iida2, Bernhard Holzapfel2, Ingolf Mönch3, and Paul Seidel1 — 1Friedrich-Schiller-Universität Jena, Institut für Festkörperphysik, Helmholtzweg 5, 07743 Jena — 2IFW Dresden, Institut für metallische Werkstoffe, Helmholtzstraße 20, 01069 Dresden — 3IFW Dresden, Institute for Integrative Nanoscience, Helmholtzstraße 20, 01069 Dresden
To investigate the properties of iron-based superconductor, we used Andreev reflection studies on planar hybrid SNS’ junctions, based on Ba-122 (S) thin films with gold layer (N) and a Pb counter electrode (S’). I-V- and differential characteristics were measured at different temperatures of each electrode as well as the junction itself. It could be noticed that both electrodes significantly effect the junction spectra due to an additional series resistance. This resistance occurs for lead at T>7.2 K and is constant, while for Ba-122 it is strongly nonlinear and suspected to be caused by the underlaying Fe buffer layer. We show how both electrodes influence the junction spectra in the measured temperature range and how to correct this. Thus, we are able to interpret the pure junction spectra within known models.
This work was partially supported by DFG under project no. HA5934/3-1 and SE664/15-1, the EU under project no. FP7-283141 (IRON-SEA), the Deutscher Akademischer Austauschdienst, and the Landesgraduiertenförderung Thüringen.