TEM imaging of clustered Au substitutional impurities in YBa2Cu3O6.9

B. G. Storey*, M. A. Kirk, L. D. Marks

*Corresponding author for this work

Research output: Contribution to journalArticle

12 Scopus citations

Abstract

Evidence for clustering of Au impurity atoms into randomly distributed 1-2 nm rods is presented for YBa2Cu3O7-δ (δ < 0.1) grown by the self-flux technique in Au crucibles. Electron-diffraction patterns show very weak diffuse streaks along «100å and «010å, and these streaks persist over several degrees of tilt indicating rod-like defects. Multislice image simulations, including the effect of amorphous carbon, for a variety of defect types are compared to high-resolution images. The model that best fits the experimental data is defects made up of 3-4 unit cell long AuO vacancy rods along «010å and AuO interstitial rods along «100å. In light of flux-pinning data comparing YBCO crystals with and without Au doping, these defects should be considered as flux-pinning sites in as-grown Au doped crystals.

Original languageEnglish (US)
Pages (from-to)46-54
Number of pages9
JournalPhysica C: Superconductivity and its applications
Volume246
Issue number1-2
DOIs
StatePublished - May 1 1995

ASJC Scopus subject areas

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

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