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Thickness dependence of microstructure and critical current density of Yba2Cu3O7−δ on rolling-assisted biaxially textured substrates

Published online by Cambridge University Press:  31 January 2011

K. J. Leonard
Affiliation:
Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6116
A. Goyal
Affiliation:
Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6116
D. M. Kroeger
Affiliation:
Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6116
J. W. Jones
Affiliation:
Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6116
S. Kang
Affiliation:
Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6116
N. Rutter
Affiliation:
Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6116
M. Paranthaman
Affiliation:
Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6116
D. F. Lee
Affiliation:
Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6116
B. W. Kang
Affiliation:
Department of Physics, Pohang University of Science & Technology, Pohang, South Korea
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Abstract

The change in microstructure associated with the decrease in critical current density (Jc) of Yba2Cu3O7−δ (YBCO) films with increasing thickness was examined. Samples of pulse laser deposited YBCO films varying in thickness from 0.19 to 3.0 μm on rolling-assisted biaxially textured substrates with an architecture of CeO2/YSZ/CeO2/Ni were prepared by tripod polishing for cross-sectional electron microscopy. More randomly oriented grains in the upper portion of the YBCO film surface were observed with increasing film thickness, resulting in less cube texture. In addition, increases in mismatch across the boundaries of the c-axis grains with increasing time during deposition, along with the development of BaCeO3 and Y2BaCuO5 phases at the YBCO/CeO2 interface, contributed to the degradation of film properties. Surface outgrowths of the YBCO film were examined as well as the defect structures and second-phase formations within the films.

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Articles
Copyright
Copyright © Materials Research Society 2003

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