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Comparative Study Between Similarly Processed {\rm YBa}_{2}{\rm Cu}_{3}{\rm O}_{7-{\rm x}} Films With {\rm Y}_{2}{\rm BaCuO}_{5} or {\rm BaSnO}_{3} Additions

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6 Author(s)
Chakrapani V. Varanasi ; Univ. of Dayton Res. Inst., Dayton, OH, USA ; J. Burke ; L. Brunke ; J. H. Lee
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A special YBa2Cu3O7-x (YBCO) target with a thin sector of second phase material, in this case either Y2BaCuO5 (Y211) or BaSnO3 (BSO), was used to deposit YBCO films with non-layered nanoparticles on single crystal LaAlO3 and biaxially textured Ni-5 at.% W substrates buffered with CeO2 and YSZ layers(coated conductors). Although identical processing conditions were used, TEM images indicated that random Y211 nanoparticles in the case of YBCO + Y211, and evenly spaced BSO nanocolumns in the case of YBCO+BSO, form in the YBCO films. While YBCO plane buckling was observed at many places in the case of YBCO + Y211, a high density of stacking faults and dislocations were observed in the case of YBCO+BSO near the BSO columns. In transport critical current density (Jc) angular dependence measurements, the absence of nanocolumns in YBCO + Y211 films resulted in the absence of a peak at 0deg , Jc(H//c) , in Jc vs. thetas plots, as compared to a clear peak at 0deg observed in YBCO+BSO films with the nanocolumns. The in-field Jc measurements indicated small low-field Jc enhancements at 77 K in YBCO + Y211 films but more than an order of magnitude improvement in high-field Jc in YBCO + BSO films due to the differences in the microstructures.

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