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- W2039365551 abstract "Direct observations of CuO(2) sheet defect structures in superconducting La(2-x)Sr(x)CuO(4), with x in the range 0.05 </= x </= 0.15, are reported. Electron microscopy shows that extended line defects are generated in {010} planes, along <206> crystallographic directions, by a pure shear mechanism along the edge of the octahedral copper-oxygen units. The line defects are partial screw dislocations, with characteristic displacement vectors of the type <(a/2), 0, (c/6)>, bounding the stacking faults. The existence of this type of defect demonstrates that there is an oxygen deficiency within the CuO(2) layers. However, unlike the open ReO(3) type-related structures, the packing density of the K(2)NiF(4) structure necessarily requires that anion defects be accompanied by the loss of cations of the A type (lanthanum, strontium). Under identical synthesis conditions, no defects are observed in the parent compound La(2)CuO(4)." @default.
- W2039365551 created "2016-06-24" @default.
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- W2039365551 date "1990-02-02" @default.
- W2039365551 modified "2023-09-23" @default.
- W2039365551 title "Direct Observation and Analysis of CuO <sub>2</sub> Shear Defects in La <sub>2-x</sub> Sr <sub>x</sub> CuO <sub>4</sub>" @default.
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- W2039365551 doi "https://doi.org/10.1126/science.247.4942.553" @default.
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