Flux growth of superconducting La2CuO4 single crystals

Authors report the first observation of superconductivity in lanthanum cuprate crystals grown in an ambient atmosphere. The best result achieved so far is (1) Tc = 32 K with DTc 3 K by ac susceptibility measurement, and (2) Tc (onset) = 36 K and Tc (zero resistance) =26 K by resistivity measurements...

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Published inPhysica. C, Superconductivity Vol. 341-348; pp. 535 - 536
Main Authors Chen, C., Smith, D.C., Gay, P., Ryan, J.F.
Format Journal Article
LanguageEnglish
Published 01.11.2000
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Summary:Authors report the first observation of superconductivity in lanthanum cuprate crystals grown in an ambient atmosphere. The best result achieved so far is (1) Tc = 32 K with DTc 3 K by ac susceptibility measurement, and (2) Tc (onset) = 36 K and Tc (zero resistance) =26 K by resistivity measurements. The solubility curve of La2CuO4 in molten CuO has been established, and large single crystals with size up to 16x15x0.1 mm3 have been obtained. The morphology of the superconducting crystals (thin plate) is different from that of insulating crystals (pyramid), which suggests a layer growth mechanism. The mechanism produces an enlarged unit cell that permits O2- intercalation. This soft oxygenation influences the superconducting properties. 6 refs.
Bibliography:ObjectType-Article-2
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ISSN:0921-4534
DOI:10.1016/S0921-4534(00)00579-7