Epitaxy of Y-Ba-Cu-O thin films grown on single-crystal MgO
Ramesh, Ramamoorthy, D. Hwang, T.S. Ravi, A. Inam, J.B. Barner, L. Nazar, S.W. Chan, C.Y. Chen, B. Dutta, T. Venkatesan, X.D. Wu
The epitaxy of a thin-film Y-Ba-Cu-O (YBCO) superconductor deposited on a single-crystal  MgO substrate was examined by transmission electron microscopy. The large lattice mismatch (8-10%) in the basal plane of YBCO and MgO is accommodated mainly by the formation of a polycrystalline, mosaic structure. The grain boundaries correspond to unique crystallographic interfaces, determined by the crystal symmetry of the substrate and the thin film.
Applied Physics Letters
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