Local structure of Y1-xCaxSr2Cu2GaO7 superconductors

J. P. Zhang*, D. A. Groenke, H. Zhang, D. I. DeLoach, B. Dabrowski, Kenneth Poeppelmeier, Vinayak P Dravid, Laurence Marks

*Corresponding author for this work

Research output: Contribution to journalArticle

7 Scopus citations

Abstract

The variation in the average and local structure of the superconductor family Y1-xCaxSr2Cu2GaO7 as calcium is substituted for yttrium (x = 0.20, 0.35, and 0.40) is presented and discussed. Electron microscopy and X-ray diffraction were the primary techniques employed. The local structure found by the use of electron microscopy and X-ray diffraction agrees with that previously derived from single crystal X-ray and neutron diffraction. The gallate can be confused with the three layer perovskite structure of YBCO (YBa2Cu3O7) because of the similarity of [011]Ga≈[100]YBCO and [010]Ga≈[110]YBCO zones. However, the composition of all crystals examined were homogeneous on a 10-100 nm scale. It was also found that the twin structure varied as a function of the calcium content.

Original languageEnglish (US)
Pages (from-to)51-60
Number of pages10
JournalPhysica C: Superconductivity and its applications
Volume202
Issue number1-2
DOIs
StatePublished - Nov 1 1992

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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