title: High field superconducting properties of Ba(Fe1-xCox)2As2 thin films.
abstract: In general, the critical current density, Jc, of type II superconductors and its anisotropy with respect to magnetic field orientation is determined by intrinsic and extrinsic properties. The Fe-based superconductors of the '122' family with their moderate electronic anisotropies and high yet accessible critical fields (Hc2 and Hirr) are a good model system to study this interplay. In this paper, we explore the vortex matter of optimally Co-doped BaFe2As2 thin films with extended planar and c-axis correlated defects. The temperature and angular dependence of the upper critical field is well explained by a two-band model in the clean limit. The dirty band scenario, however, cannot be ruled out completely. Above the irreversibility field, the flux motion is thermally activated, where the activation energy U0 is going to zero at the extrapolated zero-kelvin Hirr value. The anisotropy of the critical current density Jc is both influenced by the Hc2 anisotropy (and therefore by multi-band effects) as well as the extended planar and columnar defects present in the sample.
authors.affiliation: IFW Dresden, P.O. Box 270116, 01171 Dresden, Germany.|Karlsruhe Institute of Technology, Institute for Technical Physics, 76344 Eggenstein-Leopoldshafen, Germany.
authors.forename: Jens
authors.initials: J
authors.lastname: Hänisch
authors.affiliation: IFW Dresden, P.O. Box 270116, 01171 Dresden, Germany.|Nagoya University, Department of Crystalline Materials Science, Graduate School of Engineering, Nagoya 464-8603, Japan.
authors.forename: Kazumasa
authors.initials: K
authors.lastname: Iida
authors.affiliation: IFW Dresden, P.O. Box 270116, 01171 Dresden, Germany.|Dresden University of Technology, Faculty for Natural Science and Mathematics, 01062 Dresden, Germany.
authors.forename: Fritz
authors.initials: F
authors.lastname: Kurth
authors.affiliation: IFW Dresden, P.O. Box 270116, 01171 Dresden, Germany.
authors.forename: Elke
authors.initials: E
authors.lastname: Reich
authors.affiliation: NHMFL, Florida State University, Tallahassee, Florida 32310, USA.
authors.forename: Chiara
authors.initials: C
authors.lastname: Tarantini
authors.affiliation: NHMFL, Florida State University, Tallahassee, Florida 32310, USA.
authors.forename: Jan
authors.initials: J
authors.lastname: Jaroszynski
authors.affiliation: HZDR, Dresden High Magnetic Field Laboratory, 01328 Dresden, Germany.
authors.forename: Tobias
authors.initials: T
authors.lastname: Förster
authors.affiliation: IFW Dresden, P.O. Box 270116, 01171 Dresden, Germany.
authors.forename: Günther
authors.initials: G
authors.lastname: Fuchs
authors.affiliation: IFW Dresden, P.O. Box 270116, 01171 Dresden, Germany.
authors.forename: Ruben
authors.initials: R
authors.lastname: Hühne
authors.affiliation: IFW Dresden, P.O. Box 270116, 01171 Dresden, Germany.|Nagoya University, Department of Crystalline Materials Science, Graduate School of Engineering, Nagoya 464-8603, Japan.
authors.forename: Vadim
authors.initials: V
authors.lastname: Grinenko
authors.affiliation: IFW Dresden, P.O. Box 270116, 01171 Dresden, Germany.|Dresden University of Technology, Faculty for Natural Science and Mathematics, 01062 Dresden, Germany.
authors.forename: Ludwig
authors.initials: L
authors.lastname: Schultz
authors.affiliation: Karlsruhe Institute of Technology, Institute for Technical Physics, 76344 Eggenstein-Leopoldshafen, Germany.
authors.forename: Bernhard
authors.initials: B
authors.lastname: Holzapfel