title: High-field pauli-limiting behavior and strongly enhanced upper critical magnetic fields near the transition temperature of an arsenic-deficient LaO0.9F0.1FeAs1-delta superconductor.
abstract: We report upper critical field Bc2(T) data for disordered (arsenic-deficient) LaO0.9F0.1FeAs1-delta in a wide temperature and magnetic field range up to 47 T. Because of the large linear slope of Bc2 approximately -5.4 to -6.6 T/K near Tc approximately 28.5 K, the T dependence of the in-plane Bc2(T) shows a flattening near 23 K above 30 T which points to Pauli-limited behavior with Bc2(0) approximately 63-68 T. Our results are discussed in terms of disorder effects within [corrected] unconventional superconducting pairings.
authors.affiliation: IFW Dresden, P.O. Box 270116, D-01171 Dresden, Germany.
authors.forename: G
authors.initials: G
authors.lastname: Fuchs
authors.forename: S-L
authors.initials: SL
authors.lastname: Drechsler
authors.forename: N
authors.initials: N
authors.lastname: Kozlova
authors.forename: G
authors.initials: G
authors.lastname: Behr
authors.forename: A
authors.initials: A
authors.lastname: Köhler
authors.forename: J
authors.initials: J
authors.lastname: Werner
authors.forename: K
authors.initials: K
authors.lastname: Nenkov
authors.forename: R
authors.initials: R
authors.lastname: Klingeler
authors.forename: J
authors.initials: J
authors.lastname: Hamann-Borrero
authors.forename: C
authors.initials: C
authors.lastname: Hess
authors.forename: A
authors.initials: A
authors.lastname: Kondrat
authors.forename: M
authors.initials: M
authors.lastname: Grobosch
authors.forename: A
authors.initials: A
authors.lastname: Narduzzo
authors.forename: M
authors.initials: M
authors.lastname: Knupfer
authors.forename: J
authors.initials: J
authors.lastname: Freudenberger
authors.forename: B
authors.initials: B
authors.lastname: Büchner
authors.forename: L
authors.initials: L
authors.lastname: Schultz