Microstructure of Pb2Sr2ACu3O8 superconductors: New structures and superstructures

R. Hull, J. M. Bonar, L. F. Schneemeyer, R. J. Cava, J. J. Krajewski, J. V. Waszczak

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Abstract

We report a detailed study of the microstructure of the new class of high-Tc superconductors, Pb2Sr2ACu3O8, by transmission electron microscopy and diffraction. Several new structural and superstructural variants are observed for A=Eu+Sr, Dy+Ca/Sr or Dy+Sr. Approximately 50% of the individual crystals analyzed displayed weak violation of the c centering present in x-ray macroscopic structure determination, and superstructure variants with modulation vectors parallel to a and/or b were observed in 25% of Eu+Sr the crystals analyzed. In the A=Dy+Sr structures only, structure modulations were observed along [110] and [110] directions.

Original languageEnglish
Pages (from-to)9685-9688
Number of pages4
JournalPhysical Review B
Volume39
Issue number13
DOIs
StatePublished - 1 Jan 1989

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