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Large pinning forces and matching effects in YBa2Cu3O(7-?) thin films with Ba2Y(Nb/Ta)O6 nano-precipitates.

ABSTRACT: The addition of mixed double perovskite Ba2Y(Nb/Ta)O6 (BYNTO) to YBa2Cu3O(7-?) (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.

SUBMITTER: Opherden L 

PROVIDER: S-EPMC4758043 | biostudies-literature | 2016 Feb

REPOSITORIES: biostudies-literature

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Large pinning forces and matching effects in YBa2Cu3O(7-δ) thin films with Ba2Y(Nb/Ta)O6 nano-precipitates.

Opherden Lars L   Sieger Max M   Pahlke Patrick P   Hühne Ruben R   Schultz Ludwig L   Meledin Alexander A   Van Tendeloo Gustaaf G   Nast Rainer R   Holzapfel Bernhard B   Bianchetti Marco M   MacManus-Driscoll Judith L JL   Hänisch Jens J  

Scientific reports 20160218

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 a  ...[more]

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