Title :
YBCO/YCBCO multi-layer healing technique for YBCO coated conductors
Author :
Meng, R.L. ; Baikalov, A. ; Pham, D. ; Rusakova, I.A. ; Sun, Y.Y. ; Cmaidalka, J. ; Wang, C. ; Iliev, M.N. ; Chu, C.W.
Author_Institution :
Dept. of Phys., Univ. of Houston, TX, USA
fDate :
6/1/2005 12:00:00 AM
Abstract :
The influence of (Y0.8Ca0.2)Ba2Cu3Oy (YCBCO) over-layers on YBCO film properties has been studied on multi-layer YBCO/YCBCO films. The films were deposited on [001] MgO single-crystal substrates by pulsed-laser deposition. The results unambiguously demonstrate that a YCBCO over-layer can greatly improve the overall crystallinity of the YBCO films and thus their Jc. An optimal layer-number (n) of the multi-layer YBCO (n layers)/YCBCO (n-1 layers) has been identified to produce a maximum Jc enhancement. The observations suggest that the YBCO/YCBCO multi-layer healing technique (MLHT) mentioned above may be used for the fabrication of low cost, high performance YBCO coated conductors by relaxing the stringent and costly requirements for precise atomic alignment employed in previous fabrication methods.
Keywords :
barium compounds; conductors (electric); critical current density (superconductivity); multilayers; pulsed laser deposition; superconducting thin films; ytterbium compounds; YBCO coated conductors; YBCO film properties; YBCO/YCBCO multilayers; YBa2Cu3O7-(Y0.8Ca0.2)Ba2Cu3Oy; current density; film crystallinity; multilayer healing technique; pulsed-laser deposition; single-crystal substrates; superconducting materials; Conducting materials; Conductive films; Conductors; Costs; Crystal microstructure; Crystallization; Sun; Superconducting materials; Superconductivity; Yttrium barium copper oxide; Current density; superconducting materials; thin films;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2005.848964
