Diffraction evidence for oxygen-vacancy ordering in annealed Ba₂YCu₃O_7-δ (0.3≲δ≲0.4) superconductors

1988/02/01 by D. J. Werder, Chunlin Chen, R. J. Cava +1 · 1 citation
Physics and Astronomy · Materials Science · #Physics of Superconductivity and Magnetism #Advanced Condensed Matter Physics #Iron-based superconductors research

paper · doi:10.1103/physrevb.37.2317

openalex publication_date 1988/02/01 · openalex created_date 2020/03/27 · openalex updated_date 2026/06/26

Abstract

Diffuse streaks centered at q=(0,\ifmmode±\else\textpm\fi(2/5,0) and (0,\ifmmode±\else\textpm\fi(1/2,0) have been observed in annealed Ba₂YCu₃O_7\mathrm\ensuremath-\mathrm\ensuremathδ with 0.3\ensuremath\lesssim\ensuremathδ\ensuremath\lesssim0.4, which has a T_c of 60 K and a Meissner effect equivalent to the 90 K phase. We interpret the presence of the diffuse streaking as a result of short-range oxygen vacancy ordering. The vacancy ordering has a short correlation length along the copper-oxygen chains (b direction) and a long correlation length perpendicular to the chains along the a direction. The ordered structure is completely uncorrelated parallel to the c axis.

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• Short range order [wikipedia]