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YBa2Cu3O7−x films on off-axis Y-ZrO2 substrates using Y-ZrO2 or Y2O3 barrier layers

Published online by Cambridge University Press:  03 March 2011

C.H. Mueller ,
P.H. Holloway ,
J.D. Budai ,
F.A. Miranda  and
K.B. Bhasin
C.H. Mueller
Affiliation:
NASA Lewis Research Center, 21000 Brookpark Road, Cleveland, Ohio 44135
P.H. Holloway
Affiliation:
Department of Materials Science and Engineering, University of Florida, Gainesville, Florida 32611
J.D. Budai
Affiliation:
Solid State Division, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, Tennessee 37831-6024
F.A. Miranda
Affiliation:
NASA Lewis Research Center, 21000 Brookpark Road, Cleveland, Ohio 44135
K.B. Bhasin
Affiliation:
NASA Lewis Research Center, 21000 Brookpark Road, Cleveland, Ohio 44135
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Abstract

YBa2Cu3O7−x (YBCO) and barrier layer films were deposited on single-crystal (Y2O3)0.09(ZrO2)0.91 substrates cut between 3.6 and 35.7°off-axis from the (001) planes. The barrier layers were (Y2O3)0.065(Y-ZrO2)0.935(Y-ZrO2), Y2O3, or multilayered structures of Y-ZrO2 and Y2O3. X-ray diffraction showed that the Y-ZrO2 and Y2O3 barrier layers generally grew epitaxially on the off-axis substrates, with the (001) barrier layer film planes being parallel to those of the substrate, and the (100) directions being parallel. YBCO films deposited on Y2O3 barrier layers also showed epitaxy with the YBCO (001) planes being nearly parallel to the substrate (001) planes, even for miscuts up to 35.7°. In contrast, the (001) planes of YBCO films deposited on Y-ZrO2 barrier layers were almost parallel to the substrate surface, not the (001) substrate planes. However, YBCO films on Y-ZrO2 films maintained particular in-plane epitaxial orientations with respect to the substrate. The YBCO full-width at half-maximum (FWHM) x-ray peaks were slightly narrower (0.8°) on Y2O3 barrier layers than on Y-ZrO2 layers (1.3°). The electrical resistivity versus temperature behavior of the YBCO/Y2O3 films was consistent with increased grain boundary scattering as the degree of substrate miscut increased, whereas YBCO/Y-ZrO2 films' resistivities showed less sensitivity to substrate miscut, consistent with the loss of epitaxy.

Type
Articles
Information
Journal of Materials Research , Volume 10 , Issue 4 , April 1995 , pp. 810 - 816
Copyright
Copyright © Materials Research Society 1995

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