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Critical current density and microstructure variations in YBa2Cu3O7−x + BaSnO3 films with different concentrations of BaSnO3

Published online by Cambridge University Press:  31 January 2011

C.V. Varanasi*
Affiliation:
University of Dayton Research Institute, Dayton, Ohio 45469-0170; and Air Force Research Laboratories, Wright Patterson Air Force Base, Ohio 45433
J. Burke
Affiliation:
University of Dayton Research Institute, Dayton, Ohio 45469-0170; and Air Force Research Laboratories, Wright Patterson Air Force Base, Ohio 45433
L. Brunke
Affiliation:
University of Dayton Research Institute, Dayton, Ohio 45469-0170; and Air Force Research Laboratories, Wright Patterson Air Force Base, Ohio 45433
H. Wang
Affiliation:
Texas A&M, College Station, Texas 77843-3128
J.H. Lee
Affiliation:
Texas A&M, College Station, Texas 77843-3128
P.N. Barnes
Affiliation:
Air Force Research Laboratories, Wright Patterson Air Force Base, Ohio 45433
*
a)Address all correspondence to this author. e-mail: chakrapani.varanasi@wpafb.af.mil
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Abstract

Previous work on YBa2Cu3O7−x (YBCO) + BaSnO3 (BSO) films with a single composition showed significant critical current density (Jc) improvements at higher fields but lowered Jc in low fields. A detailed study on BSO concentrations provided here demonstrates that significant Jc enhancement can occur even up to 20 mol% BSO inclusion, where typical particulate inclusions in these concentrations degrade the YBCO performance. YBCO + BSO films were processed on (100) LaAlO3 substrates using premixed targets of YBa2Cu3O7-x (YBCO) with additions of 2, 4, 10, and 20 mol% BSO. The critical transition temperature Tc of the films remained high (>87 K), even with large amounts (20 mol%) of BSO. YBCO + BSO films showed a gradual increase in Jc at high fields as the amount of BSO was increased. More than an order of magnitude increase in Jc was measured in YBCO + BSO samples as compared to regular YBCO at 4 T. YBCO + 10 mol% BSO films showed overall improvement at all the field ranges while YBCO + 20 mol% BSO was better only at high fields. Transmission electron microscopy revealed the presence of ∼7–8-nm-diameter BSO nanocolumns, the density of which increased with increasing BSO content correlating well with the observed improvements in Jc.

Type
Articles
Copyright
Copyright © Materials Research Society 2008

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References

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