Abstract
The crystal structure of the La 1.6Sr 0.4CaCu 2O 6± δ superconductor has been determined by neutron diffraction powder profile refinement at room temperature on a slightly oxygen deficient sample (δ=-0.06, T c=55 K). The crystal structure is very similar to that of the nonsuperconducting host compound La 1.9Ca 1.1Cu 2O 6−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 CuO 2 planes. Oxygen deficiency occurs in the apical oxygen sites. The compound has the tetragonal symmetry characteristic of a square CuO 2 plane at room temperature and 10 K, making it differ from the single-layer analog (La, Sr) 2CuO 4 which has a buckled, distorted CuO 2 plane in the superconducting state.
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