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High I_{\rm c} in YBCO Films Grown at Very High Rates by Liquid Mediated Growth

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10 Author(s)
MacManus-Driscoll, J.L. ; Dept. of Mater. Sci. & Metall., Univ. of Cambridge, Cambridge, UK ; Kursumovic, A. ; Durrell, J.H. ; Harrington, S.
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YBa2Cu3O7-x (YBCO) thick films were grown by hybrid liquid phase epitaxy (HLPE) on (001) SrTiO3 (STO) substrates. With introduction of Au into the film via diffusion from a 5 mol.% 100 nm thick Au-doped STO buffer, self-field Jcs at 77 K of ~ 2.4 MAcm-2 and I cs up to 700 A/cm-width of were achieved. The J c value is virtually independent on thickness and growth rates are extremely high ( ~ 1 mum/min) without the need for post-growth processing. From transmission electron microscopy (TEM), Y2O3 nano-cloud extended defects ( ~ 100 nm size), but < 100 nm apart, were identified as the pinning defects in the films. The single crystal results were successfully translated to tapes, giving self-field Ics of around 300 A/cm-width.

Published in:

Applied Superconductivity, IEEE Transactions on  (Volume:19 ,  Issue: 3 )

Date of Publication:

June 2009

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