Abstract
THE Received 28 November; accepted 5 December 1991. superconducting copper oxide system Bi–Sr–Ca–Cu–O (BSCCO) has attracted much attention owing to its high transition temperatures Tc and its stability on exposure to air, relative to the corresponding properties of the Y–Ba–Cu– O system. But despite intense effort, growth techniques capable of yielding as-deposited films with high Tc and high critical current density, Jc, have not yet been forthcoming. Here we report the preparation and properties of c-axis-oriented single-phase Bi2Sr2Ca2Cu3Ox films grown in situ without post-annealing by metalorganic chemical vapour deposition (MOCVD). Our films have the highest Tc and Jc at 77 K reported so far for BSCCO films grown in situ; one film had a zero-resistance Tc of 97 K, and a Jc of 3.8 × 105 A cm−2 at 77 K in zero magnetic field. This film showed little degradation of Jc in magnetic fields of up to 8 T applied parallel to the crystallographic a–b plane. The magnetic-field dependence of Jc and observed surface morphologies strongly suggest that these as-grown films have no weak links, which is a promising characteristic for device applications.
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Endo, K., Yamasaki, H., Misawa, S. et al. High-quality superconducting thin films of Bi2Sr2Ca2Cu3Ox grown in situ by metalorganic CVD. Nature 355, 327–328 (1992). https://doi.org/10.1038/355327a0
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DOI: https://doi.org/10.1038/355327a0
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