Electron microscopy of superconducting Pb2Sr2Y1-xCaxCu3O8

E. A. Hewat, J. J. Capponi, R. J. Cava, C. Chaillout, M. Marezio, J. L. Tholence

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Abstract

Electron microscope results are presented on Pb2Sr2Y1-xCaxCu3O8+∂ (for x=0 and x=0.5, ∂≈O) with a unit cell of a=5.40, b=5.43 and c=15.75 Å. Very weak but well defined h, k, reflections for h+k odd are always present and the crystals are twinned on (110) planes. This twinning plane is at 45° to that found in YBa2Cu3O7. These observations indicate that the orthorhombic unit cell {check mark}2ap × {check mark}2ap × c (where ap is the perovskite unit cell) induced by a small displacement of the oxygen atoms in the PbO layers is well ordered and not C centered. No additional long range superstructure was found in the samples studied. A low density of (001) twist boundaries and [110] tilt boundaries are present. No intergrowths or stacking faults in the basic cation lattice were ever observed. However low magnification images show that a few isolated layers have a slightly higher scattering density than their neighbours, while retaining the same c spacing. This can be interpreted as the presence of additional oxygen in the PbO-Cu-PbO layers concerned.

Original languageEnglish (US)
Pages (from-to)509-514
Number of pages6
JournalPhysica C: Superconductivity and its applications
Volume157
Issue number3
DOIs
StatePublished - Mar 1 1989
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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