Ba2YCu3O7-δ crystal surface layers: Orthorhombic splitting, dislocations, and chemical etching

D. J. Werder, C. H. Chen, M. Gurvitch, B. Miller, L. F. Schneemeyer, J. V. Waszczak

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We find by transmission electron diffraction that the orthorhombic splitting of the upper surface layers ( <1 μm) of single crystal Ba2YCu3O7-δ is reduced, differing by 10 to 30 percent from the bulk value. We also find by transmission electron microscopy that in general the surfaces are of inferior quality and, thus, not representative of the bulk. These results have important consequences for those experiments that probe only the upper surface layers. By etching with Br/ethanol and HClO4/NaClO4 the poor quality surfaces are removed.

Original languageEnglish
Pages (from-to)411-416
Number of pages6
JournalPhysica C: Superconductivity and its applications
Issue number5-6
StatePublished - 1 Oct 1989


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