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Large pinning forces and matching effects in YBa 2 Cu 3 O 7-δ thin films with Ba 2 Y ( Nb / Ta ) O 6 nano-precipitates
| Content Provider | Semantic Scholar |
|---|---|
| Author | Opherden, Lars Sieger, Max Patrick Hühne Ludwig Gustaaf Rainer Marco Ianchetti Manus, Judith L. Mac Hänisch, Jens |
| Copyright Year | 2016 |
| Abstract | The addition of mixed double perovskite Ba2Y(Nb/Ta)O6 (BYNTO) to YBa2Cu3O7−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. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://doc.anet.be/docman/docman.phtml?file=.irua.280c4d.131920.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
