title: Large pinning forces and matching effects in YBa2Cu3O(7-δ) thin films with Ba2Y(Nb/Ta)O6 nano-precipitates.
abstract: The addition of mixed double perovskite Ba2Y(Nb/Ta)O6 (BYNTO) to YBa2Cu3O(7-δ) (YBCO) thin films leads to a large improvement of the in-field current carrying capability. For low deposition rates, BYNTO grows as well-oriented, densely distributed nanocolumns. We achieved a pinning force density of 25 GN/m(3) at 77 K at a matching field of 2.3 T, which is among the highest values reported for YBCO. The anisotropy of the critical current density shows a complex behavior whereby additional maxima are developed at field dependent angles. This is caused by a matching effect of the magnetic fields c-axis component. The exponent N of the current-voltage characteristics (inversely proportional to the creep rate S) allows the depinning mechanism to be determined. It changes from a double-kink excitation below the matching field to pinning-potential-determined creep above it.
authors.affiliation: IFW Dresden, Institute for Metallic Materials, P.O. Box 270116, 01171 Dresden, Germany.|TU Dresden, Institute for Solid-State Physics, 01062 Dresden, Germany.|Dresden High Magnetic Field Laboratory (HLD-EMFL), Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany.
authors.forename: Lars
authors.initials: L
authors.lastname: Opherden
authors.affiliation: IFW Dresden, Institute for Metallic Materials, P.O. Box 270116, 01171 Dresden, Germany.
authors.forename: Max
authors.initials: M
authors.lastname: Sieger
authors.affiliation: IFW Dresden, Institute for Metallic Materials, P.O. Box 270116, 01171 Dresden, Germany.|TU Dresden, Institute for Solid-State Physics, 01062 Dresden, Germany.
authors.forename: Patrick
authors.initials: P
authors.lastname: Pahlke
authors.affiliation: IFW Dresden, Institute for Metallic Materials, P.O. Box 270116, 01171 Dresden, Germany.
authors.forename: Ruben
authors.initials: R
authors.lastname: Hühne
authors.affiliation: IFW Dresden, Institute for Metallic Materials, P.O. Box 270116, 01171 Dresden, Germany.|TU Dresden, Institute for Solid-State Physics, 01062 Dresden, Germany.
authors.forename: Ludwig
authors.initials: L
authors.lastname: Schultz
authors.affiliation: University of Antwerp, EMAT Research Group, Groenenborgerlaan 171, 2020 Antwerp, Belgium.
authors.forename: Alexander
authors.initials: A
authors.lastname: Meledin
authors.affiliation: University of Antwerp, EMAT Research Group, Groenenborgerlaan 171, 2020 Antwerp, Belgium.
authors.forename: Gustaaf
authors.initials: G
authors.lastname: Van Tendeloo
authors.affiliation: KIT, Institute for Technical Physics, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen,Germany.
authors.forename: Rainer
authors.initials: R
authors.lastname: Nast
authors.affiliation: KIT, Institute for Technical Physics, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen,Germany.
authors.forename: Bernhard
authors.initials: B
authors.lastname: Holzapfel
authors.affiliation: University of Cambridge, Department of Materials Science and Metallurgy, 27 Charles Babbage Rd., Cambridge, CB3 0FS, UK.
authors.forename: Marco
authors.initials: M
authors.lastname: Bianchetti
authors.affiliation: University of Cambridge, Department of Materials Science and Metallurgy, 27 Charles Babbage Rd., Cambridge, CB3 0FS, UK.
authors.forename: Judith L
authors.initials: JL
authors.lastname: MacManus-Driscoll
authors.affiliation: IFW Dresden, Institute for Metallic Materials, P.O. Box 270116, 01171 Dresden, Germany.|KIT, Institute for Technical Physics, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen,Germany.
authors.forename: Jens
authors.initials: J
authors.lastname: Hänisch