Abstract
Since the report that multiphase mixture with the nominal composition La2−xBaxCCuO4−J, exhibit possible superconductivity1, research on this class of quaternary oxides has increased enormously. The superconducting compound in the original mixture was rapidly identified as La1.85Ba0.15CuO42, and subsequent research concentrated on the most suitable cation substitutions in this compound. A new oxide with a considerably higher critical temperature, Tc, was very soon found in the phase system Y2O3-BaO–CuO3, later identified by several groups as YBa2Cu3O7–δ; and now commonly known as the 1–2–3 compound. Intensive activity in structural characterization followed including reports of various planar defects. Here we report an analysis, using high-resolution electron microscopy of planar defects in superconducting YBa2Cu3O7, revealing the identity of a CuO double layer intercalation. Within this double layer, the Cu atoms remain in planar fourfold coordination with O, identical to their arrangement in the single CuO layers of the YBa2Cu3O7 matrix.
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Zandbergen, H., Gronsky, R., Wang , K. et al. Structure of (CuO)2 double layers in superconducting YBa2Cu3O7. Nature 331, 596–599 (1988). https://doi.org/10.1038/331596a0
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DOI: https://doi.org/10.1038/331596a0
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