The crystal structure of the La1.6Sr0.4CaCu2O6±δ superconductor

R. J. Cava, A. Santoro, J. J. Krajewski, R. M. Fleming, J. V. Waszczak, W. F. Peck, P. Marsh

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The crystal structure of the La1.6Sr0.4CaCu2O6±δ superconductor has been determined by neutron diffraction powder profile refinement at room temperature on a slightly oxygen deficient sample (δ=-0.06, Tc=55 K). The crystal structure is very similar to that of the nonsuperconducting host compound La1.9Ca1.1Cu2O6-δ. Sr substitutes on the nine coordinate La sites, and there may be some La/Ca mixing on the eight coordinate metal site between the CuO2 planes. Oxygen deficiency occurs in the apical oxygen sites. The compound has the tetragonal symmetry characteristic of a square CuO2 plane at room temperature and 10 K, making it differ from the single-layer analog (La, Sr)2CuO4 which has a buckled, distorted CuO2 plane in the superconducting state.

Original languageEnglish (US)
Pages (from-to)138-142
Number of pages5
JournalPhysica C: Superconductivity and its applications
Issue number1-2
StatePublished - Dec 1 1990
Externally publishedYes

All Science Journal Classification (ASJC) codes

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


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