| Autor: |
Mikheenko, P., Dang, V.-S., Awang Kechik, M. M., Sarkar, A., Paturi, P., Huhtinen, H., Abell, J. S., Crisan, A. |
| Předmět: |
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| Zdroj: |
IEEE Transactions on Applied Superconductivity; Jun2011, Vol. 21 Issue 3, p3184-3188, 5p |
| Abstrakt: |
We report on an original technique for nanoengineered pinning centers that combine three previously reported approaches: substrate decoration, quasi-multilayers and targets with secondary phase nanoinclusions. We have used a 4% BZO-doped YBCO target, and Ag nanodots, all grown by PLD. Such an approach gave interesting results in terms of pinning landscape, as proved by TEM studies. Angle-dependent measurements of critical current Ic showed that, for smaller fields, the absolute maximum in Ic occur for fields perpendicular to the a-b planes, while at larger fields the absolute maximum in Ic occurs for fields parallel to the a-b planes, in both cases with a clear second, local maxima. Measurements also showed a smooth change in the character of pinning with magnetic field, from the out-of-plane to in-plane-dominant pinning. For the out-of-plane magnetic field, the highest Ic{\-w} (critical current per cm width) obtained so far, at 77.3 K, occurred in a 5.8 \mum Ag nanodots / BZO-doped YBCO trilayer: 782 A/cm-w in self-field, 167 A/cm-w in 1 T and 18 A/cm-w in 3 T. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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