In:
Scientific Reports, Springer Science and Business Media LLC, Vol. 6, No. 1 ( 2016-02-18)
Abstract:
The addition of mixed double perovskite Ba 2 Y(Nb/Ta)O 6 (BYNTO) to YBa 2 Cu 3 O 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.
Type of Medium:
Online Resource
ISSN:
2045-2322
Language:
English
Publisher:
Springer Science and Business Media LLC
Publication Date:
2016
detail.hit.zdb_id:
2615211-3
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