Meandering grain boundaries in YBa2Cu3Oy bi-crystal thin films

D. J. Miller, T. A. Roberts, J. H. Kang, J. Talvacchio, D. B. Buchholz, Robert P. H. Chang

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Abstract

Artificially induced [001] tilt grain boundaries in epitaxial YBa2Cu3Oy (YBCO) thin films were prepared by deposition onto SrTiO3 bi-crystal substrates and subsequently examined by transmission electron microscopy and atomic force microscopy (AFM). It was found that the YBCO grain boundary deviated from the path defined by the underlying substrate boundary, with the]] meandering" YBCO boundary only generally following the path defined by the boundary in the underlying substrate. The AFM studies suggest this]] meandering" behavior is related to the nucleation and growth mechanisms of the film, and based on this, we were able to vary the magnitude of the meandering by changing the growth conditions. The implications of this meandering behavior are significant, suggesting potential variations in electrical behavior from point to point along these boundaries. This effect is likely to be exacerbated by reduced junction linewidths and may lead to inconsistent behavior in devices which utilize this type of boundary.

Original languageEnglish
Pages (from-to)2561
Number of pages1
JournalApplied Physics Letters
Publication statusPublished - 1995

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ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

Cite this

Miller, D. J., Roberts, T. A., Kang, J. H., Talvacchio, J., Buchholz, D. B., & Chang, R. P. H. (1995). Meandering grain boundaries in YBa2Cu3Oy bi-crystal thin films. Applied Physics Letters, 2561.