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Control of meandering grain boundary configurations in YBa2Cu3Oy bicrystal thin films based on deposition rate

Published online by Cambridge University Press:  31 January 2011

X. F. Zhang ,
D. J. Miller  and
J. Talvacchio
X. F. Zhang
Affiliation:
Materials Science Division and Science and Technology Center for Superconductivity, Argonne National Laboratory, Argonne, Illinois 60439
D. J. Miller
Affiliation:
Materials Science Division and Science and Technology Center for Superconductivity, Argonne National Laboratory, Argonne, Illinois 60439
J. Talvacchio
Affiliation:
Westinghouse Science and Technology Center, Pittsburgh, Pennsylvania 15235
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Abstract

Changing the film deposition rate is shown to be one way to influence the meandering configurations of grain boundaries (GB's) formed in YBa2Cu3Oy (YBCO) bicrystal thin films. The magnitude and wavelength of the meander in YBCO films deposited at two different rates have been characterized by transmission electron microscopy (TEM) and statistically quantified. It has been found that the meander becomes more uniform and considerably less rough in films deposited at lower rates compared to that observed in films deposited at higher rates. A mechanism for the formation of the meandering GB is proposed based on heterogeneous nucleation and three-dimensional (3D) island growth together with overgrowth of the YBCO films across the substrate grain boundary. The different island sizes and tendency for overgrowth induced by changing the film deposition rate are believed to play important roles in controlling the meandering GB configuration. The possible effects of meandering configurations on transport properties are discussed.

Type
Articles
Information
Journal of Materials Research , Volume 11 , Issue 10 , October 1996 , pp. 2440 - 2449
Copyright
Copyright © Materials Research Society 1996

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References

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