Angular dependent vortex pinning mechanisms in YBCO coated conductors and thin films

Details Angular dependent vortex pinning mechanisms in YBCO coated conductors and thin films Angular dependent vortex pinning mechanisms in YBCO coated conductors and thin films

2003-10-23

arxiv.org/abs/cond-mat/0310568v1

Applied Physics Letters 84, (2004) 2121

Physics

Condensed Matter

Superconductivity

14 pages, 3 figures. Submitted to APL

Scientific paper

10.1063/1.1655707

We present a comparative study of the angular dependent critical current density in YBa2Cu3O7 films deposited on IBAD MgO and on single crystal MgO and SrTiO3 substrates. We identify three angular regimes where pinning is dominated by different types of correlated and uncorrelated defects. We show that those regimes are present in all cases, indicating that the pinning mechanisms are the same, but their extension and characteristics are sample dependent, reflecting the quantitative differences in texture and defect density. In particular, the more defective nature of the films on IBAD turns into an advantage as it results in stronger vortex pinning, demonstrating that the critical current density of the films on single crystals is not an upper limit for the performance of the IBAD coated conductors.

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