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TT: Fachverband Tiefe Temperaturen

TT 57: SC: Fe-based Superconductors - 122 - Thin Films

TT 57.1: Vortrag

Donnerstag, 17. März 2011, 17:15–17:30, HSZ 304

New routes for epitaxial thin films of Fe-based superconductors — Thomas Thersleff, •Silvia Haindl, Kazumasa Iida, Fritz Kurth, Jan Engelmann, Martin Kidszun, Sascha Trommler, Jens Hänisch, Alexander Kauffmann, Elke Reich, Ruben Hühne, Darius Pohl, Andreas Hartmann, Bernd Rellinghaus, Ludwig Schultz, and Bernhard Holzapfel — Institute for Metallic Materials, IFW Dresden

With the recent discovery of the Fe-based superconductors, a major question raised is their suitability for applications. Many of the most interesting devices require the controlled production of thin films with clean interfaces. During the laboratory production of Fe-based superconductor thin films, a detailed analysis by TEM of the substrate/film interface revealed evidence for secondary phase formation. On the basis of the observation of the formation of an Fe layer at the substrate/film interface for Co-doped BaFe₂As₂, we designed a bonding scheme between Fe and the iron pnictide phase, resulting in a new thin film architecture we have termed the ^′Fe/Ba-122^′ bilayer system. The first results from this system reveal greatly enhanced growth properties and critical current densities with regard to deposition on pure oxide substrates and may provide a key to understanding a more general growth mechanism in this system.