Regensburg 2010 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 34: SC: Iron-Based Superconductors - 122
TT 34.13: Vortrag
Donnerstag, 25. März 2010, 17:15–17:30, H20
Jc anisotropy in 122 and 1111 pnictide thin films — •Jens Hänisch, Kazumasa Iida, Martin Kidszun, Sivia Haindl, Thomas Thersleff, Alexander Kauffmann, Fritz Kurth, Bernhard Holzapfel, and Ludwig Schultz — IFW Dresden, Institute for Metallic Materials, P.O. Box: 270116, 01171 Dresden, Germany
We have successfully grown epitaxial, superconducting films in two families of iron pnictides, Ba(Fe1−xCox)2As2 (122) [1] and LaFeAs(O1−x,Fx) (1111) [2]. Detailed investigations of their critical current density Jc with respect to temperature as well as both the applied magnetic field magnitude and orientation will be shown in this contribution. Both films grow very clean and without observable correlated defects parallel to the c-axis, as confirmed by TEM. This is also reflected in the absence of a c-axis peak in Jc(θ). In contrast to cuprate high-Tc superconductors such as YBCO or even Bi2223, the pnictides have very low anisotropies in their Jc(θ) behaviour as well as in their characteristic and critical fields, such as Hirr and Hc2. Both families show the same anisotropy behaviour, 122 having slightly lower anisotropies.
[1] K. Iida, J. Hänisch, R. Hühne, F. Kruth, M. Kidszun, S. Haindl, J. Werner, L. Schultz and B. Holzapfel, Appl. Phys. Lett. 95, 192501 (2009).
[2] M. Kidszun, S. Haindl, E. Reich, J. Hänisch, K. Iida, L. Schultz and B. Holzapfel, Supercond. Sci. and Techn., in print.