Grain boundaries in YBa2Cu3O7-δ thin films deposited on (001)-MgO by pulsed laser ablation have been characterized using selected area diffraction. In addition to twin boundaries, the presence of both low-angle and high-angle grain boundaries were characteristic of the film’s microstructure. The presence of certain grain boundaries may be responsible for the weak-link Josephson behavior observed in small constrictions formed in superconducting films on MgO.
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Norton, M.G., Tietz, L.A., Carter, C.B. et al. Grain Boundaries in Yba2 Cu3O7-δ Thin Films. MRS Online Proceedings Library 169, 513–515 (1989). https://doi.org/10.1557/PROC-169-513