Dresden 2011 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 17: SC: Fe-based Superconductors - 1111

TT 17.6: Talk

Monday, March 14, 2011, 19:30–19:45, HSZ 301

Critical current density and scaling behavior of oxypnictide thin films — •Martin Kidszun, Silvia Haindl, Jens Hänisch, Alexander Kauffmann, Thomas David Thersleff, Ludwig Schultz, and Bernhard Holzapfel — IFW Dresden, Institute for Metallic Materials, PO - Box 270116, D-01171 Dresden, Germany

The successful growth of epitaxial LaFeAs(O,F) and SmFeAs(O,F) thin films opens the way to study intrinsic properties of this novel superconductors. Exploring the magnetic phase diagram up to 42 T we were able to investigate the temperature dependence and anisotropy of the upper critical field as well as the irreversibility field in these iron oxypnictides. The anisotropy of the irreversibility field was determined using a combination of resistive measurements in high magnetic fields and critical current density measurements. We have demonstrated that critical current densities can be scaled using the approach described by the anisotropic GL formalism.