Regensburg 2013 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 23: Superconductivity: Fe-based Superconductors - 1111
TT 23.1: Vortrag
Montag, 11. März 2013, 16:45–17:00, H21
Anisotropy of normal state and superconducting properties of oxypnictides — •Silvia Haindl1, Martin Kidszun1, Alexander Kauffmann1, Nadja Kozlova1, Kazumasa Iida1, Thomas Thersleff1,2, Takahiko Kawaguchi3, Hiroshi Ikuta3, Erik Kampert4, Jochen Wosnitza4, Oleksii Vakaliuk1, Nadezda Panarina1, Christian Hess1, and Bernd Büchner1 — 1IFW Dresden, P.O.Box 270116, 01171 Dresden, Germany — 2The Ångström Laboratory, Department of Engineering Sciences, Division of Applied Materials Science, Uppsala University, 752 37 Uppsala, Sweden — 3Department of Crystalline Materials Science, Nagoya University, Nagoya 464-8603, Japan — 4Hochfeld-Magnetlabor Dresden (HLD), Helmholtz-Zentrum Dresden-Rossendorf, D-01314 Dresden, Germany
The very large upper critical fields of the oxypnictides complicate the experimental determination of their anisotropy, γHc2, especially at low temperatures. In Kidszun et al., PRL 106, 137001 (2011), we have applied the anisotropic Ginzburg-Landau scaling on angular-dependent critical-current densities measured for an epitaxially grown La(O1−xFx)FeAs thin film (see review by Haindl et al., Int. J. Mod. Phys. B). The obtained scaling parameter matches γHc2 as can be demonstrated by recent magnetotransport measurements in pulsed magnetic fields up to 70 T and down to 2 K. Using the method of critical current scaling Hc2ab for Nd(O1−xFx)FeAs is extrapolated. In addition we discuss normal state electrical transport properties of La(O1−xFx)FeAs and Nd(O1−xFx)FeAs thin films.
Work supported by DFG: projects HA5934/1-1, HA5934/4-1 and partially HA5934/3-1.