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TT: Fachverband Tiefe Temperaturen

TT 30: Superconductivity - Poster Session

TT 30.40: Poster

Monday, March 31, 2014, 15:00–19:00, P2

Strain experiments on Fe based superconductors using flexible substrates — •Stefan Richter, Sascha Trommler, Fritz Kurth, Kazumasa Iida, Jens Hänisch, Ludwig Schultz, and Ruben Hühne — IFW Leibnitz Institute for Solid State and Materials Research Dresden

Strain is known to have a significant influence on the superconducting properties. Especially uniaxial strain experiments are promising to provide insight in correlations between structure and superconducting properties of anisotropic materials like high temperature superconductors.
However, a systematic investigation of these effects is often difficult since the strain in the sample cannot be easily controlled.
Therefore, we constructed a special bending system that allows changing dynamically the strain in samples based on metallic substrates while simultaneously measuring the electronic properties. Highly textured Ba(Fe_(1−x)Co_x)₂As₂ thin films grown on flexible IBAD-MgO/Hastelloy substrates by pulsed laser deposition are used for these studies. Depending on the doping level, these films show a superconducting transition temperature of up to 20 K as well as high critical current densities. Based on the bending experiments we will discuss the influence of strain on the superconducting properties.