Oxygen vacancy ordering in superconducting Nd2-xCexCuO4-y

Tim Williams, Yoshiteru Maeno, Iris Mangelschots, Armin Reller, Georg Bednorz

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We report transmission electron microscopy results which show that an appreciable fraction of superconducting ceramic and single-crystal samples of the Nd2-xCexCuO4-y T' phase shows evidence for oxygen vacancies in the [Cu-O] planes which in some cases are ordered, either commensurately or incommensurately with the cation sublattice. As T' phase samples displaying a 100% Meissner signal are not yet available we cannot determine unambigously whether or not the oxygen loss is associated with superconduction but our results strongly suggest that supercell formation accompanying vacancy ordering occurs in over-reduced material which is no longer superconducting.

Original languageEnglish
Pages (from-to)331-344
Number of pages14
JournalPhysica C: Superconductivity and its Applications
Issue number3
Publication statusPublished - 15 Nov 1989
Externally publishedYes

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