Dresden 2014 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 30: Superconductivity - Poster Session
TT 30.43: Poster
Monday, March 31, 2014, 15:00–19:00, P2
Preparation of planar SN and SNS‘ junctions on Ba-122 iron pnictide single crystals — •Noor Hasan1, Stefan Schmidt1, Sebastian Döring1, Volker Tympel1, Frank Schmidl1, Paul Seidel1, and Thomas Wolf2 — 1Friedrich-Schiller- Universität Jena , Institut für Festkörperphysik — 2Karlsruhe Institute of Technology, Institut für Festkörperphysik
In order to understand the nature of the superconductivity in iron pnictides it is necessary to examine their electrical properties. Therefore we firstly have fabricated planar hybrid superconductor (S) - normal metal (N) - superconductor (SNS*) junctions with a Pb thin film as basis electrode. We used an artificial (barrier) layer which consists of thin normal conducting gold and titanium films. By oxygenation of the titanium we can add an insulating layer to the barrier system. A double layer film of Pb and In was used as the counter electrode. Then we fabricated the same junction type with a basis electrode using undoped BaFe2As2 single crystals which were produced with a self-flux method. After that we transferred the technology to superconducting Co-doped BaFe2As2 single crystals. For comparison between them we will present electrical measurements on these junctions. These include R*T measurements on each electrode and the different junction*s types itself as well as temperature dependent I-V characteristic and differential conductance respectively.