Synthesis and Structure of a New Family of Cuprate Superconductors: LnSr2Cu2GaO7

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

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42 Scopus citations


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 YBa2Cu3O7and 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 (US)
Pages (from-to)935-940
Number of pages6
JournalChemistry of Materials
Issue number5
StatePublished - Sep 1 1991

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry


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