Regensburg 2010 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 20: SC: Fabrication and Characterization of Iron-Based and Other Superconductors

TT 20.8: Talk

Wednesday, March 24, 2010, 11:30–11:45, H19

Magnetic phase diagram of iron pnictide thin films — •Silvia Haindl, Martin Kidszun, Fritz Kurth, Kazumasa Iida, Alexander Kauffmann, Nadezda Kozlova, Jens Freudenberger, Jens Hänisch, Konstantin Nenkov, Ludwig Schultz, and Bernhard Holzapfel — IFW Dresden, Institute for Metallic Materials, PO - Box 270116, D-01171 Dresden

The new iron pnictide superconductors with transition temperatures up to 55 K and high upper critical fields are found to be candidates for multiband superconductivity as it has been suggested by theory and experiment. A serious investigation, however, is restricted to single crystals and epitaxial thin films. Latter offer a defined current path (two-dimensionality) and a higher voltage resolution in transport measurements. Epitaxial LaFeAsO_1−xF_x and Co-doped BaFe₂As₂ thin films have been successfully grown by pulsed laser deposition (PLD). We have performed transport measurements in static fields up to 14 T and pulsed fields up to 42 T for different crystallographic directions. The upper critical field and its temperature dependent anisotropy are discussed in terms of a two gap superconductivity scenario. In addition, the vortex matter has been studied using a vibrating sample magnetometer (VSM).