Details

Autor(en) / Beteiligte

• Opherden, Lars
• Sieger, Max
• Pahlke, Patrick
• Hühne, Ruben
• Schultz, Ludwig
• Meledin, Alexander
• Van Tendeloo, Gustaaf
• Nast, Rainer
• Holzapfel, Bernhard
• Bianchetti, Marco
• Macmanus-driscoll, Judith L
• Hänisch, Jens

Titel

Large pinning forces and matching effects in YBa2Cu3O7-[delta] thin films with Ba2Y(Nb/Ta)O6 nano-precipitates

Ist Teil von

• Scientific reports, 2016-02, Vol.6, p.21188

Ort / Verlag

London: Nature Publishing Group

Erscheinungsjahr

2016

Link zum Volltext

Quelle

Free E-Journal (出版社公開部分のみ）

Beschreibungen/Notizen

• The addition of mixed double perovskite Ba2 Y(Nb/Ta)O6 (BYNTO) to YBa2 Cu3 O7-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/m3 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.