title: High upper critical fields and evidence of weak-link behavior in superconducting LaFeAsO1-xFx thin films.
abstract: Superconducting LaFeAsO1-xFx thin films were grown on single crystalline LaAlO3 substrates with critical temperatures (onset) up to 28 K. Resistive measurements in high magnetic fields up to 40 T reveal a paramagnetically limited upper critical field mu{0}H{c2}(0) around 77 T and a remarkable steep slope of -6.2 T K-1 near T{c}. From transport measurements we observed weak-link behavior in low magnetic fields and evidence for a broad reversible regime.
authors.affiliation: IFW Dresden, P. O. Box 270116, D-01171 Dresden, Germany. S.Haindl@ifw-dresden.de
authors.forename: S
authors.initials: S
authors.lastname: Haindl
authors.forename: M
authors.initials: M
authors.lastname: Kidszun
authors.forename: A
authors.initials: A
authors.lastname: Kauffmann
authors.forename: K
authors.initials: K
authors.lastname: Nenkov
authors.forename: N
authors.initials: N
authors.lastname: Kozlova
authors.forename: J
authors.initials: J
authors.lastname: Freudenberger
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authors.lastname: Thersleff
authors.forename: J
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authors.lastname: Hänisch
authors.forename: J
authors.initials: J
authors.lastname: Werner
authors.forename: E
authors.initials: E
authors.lastname: Reich
authors.forename: L
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authors.lastname: Schultz
authors.forename: B
authors.initials: B
authors.lastname: Holzapfel