Synthesis and structure of a new family of cuprate superconductors: LnSr2Cu2GaO7

J. T. Vaughey, J. P. Thiel, E. F. Hasty, D. A. Groenke, Charlotte L. Stern, K. R. Poeppelmeier, B. Dabrowski, D. G. Hinks, A. W. Mitchell

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Abstract

The synthesis of layered cuprates with nonmagnetic and fixed oxidation state cations separating the Cu-O planes has, until now, led to nonsuperconducting materials. A new series of layered copper oxides with the general formula LnSr2Cu2GaO7 (Ln = La-Yb, Y) has been synthesized. The structure has been studied by both powder neutron diffraction and single-crystal X-ray analysis. The typical unit cell is a ≈ 22.8 Å, b ≈ 5.5 Å, c ≈ 5.4 Å, in space group Ima2 (No. 46). The structure is closely related to that of YBa2Cu3O7 and can be described as replacement of the square-planar copper with a tetrahedral gallium. The larger lanthanides are distributed unevenly over the two A-cation sites, whereas the smaller lanthanides occupy the site between the cuprate planes. We have been able to introduce superconductivity in the Y-Sr-Cu-Ga-O system by appropriate doping with calcium and annealing.

Original languageEnglish
Pages (from-to)935-940
Number of pages6
JournalChemistry of Materials
Volume3
Issue number5
Publication statusPublished - 1991

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ASJC Scopus subject areas

  • Materials Chemistry
  • Materials Science(all)

Cite this

Vaughey, J. T., Thiel, J. P., Hasty, E. F., Groenke, D. A., Stern, C. L., Poeppelmeier, K. R., Dabrowski, B., Hinks, D. G., & Mitchell, A. W. (1991). Synthesis and structure of a new family of cuprate superconductors: LnSr2Cu2GaO7. Chemistry of Materials, 3(5), 935-940.