Local structure of Y1-xCaxSr2Cu2GaO7 superconductors

J. P. Zhang, D. A. Groenke, H. Zhang, D. I. DeLoach, B. Dabrowski, Kenneth R Poeppelmeier, V. P. Dravid, L. D. Marks

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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
Pages (from-to)51-60
Number of pages10
JournalPhysica C: Superconductivity and its Applications
Volume202
Issue number1-2
DOIs
Publication statusPublished - Nov 1 1992

ASJC Scopus subject areas

  • Condensed Matter Physics

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    Zhang, J. P., Groenke, D. A., Zhang, H., DeLoach, D. I., Dabrowski, B., Poeppelmeier, K. R., Dravid, V. P., & Marks, L. D. (1992). Local structure of Y1-xCaxSr2Cu2GaO7 superconductors. Physica C: Superconductivity and its Applications, 202(1-2), 51-60. https://doi.org/10.1016/0921-4534(92)90295-N