Abstract
The crystal structure of a cuprate containing CO 3 groups, (C 0.58Cu 0.42)(Sr 0.88Ca 0.12) 2(Y 0.50Ca 0.26Sr 0.24)Cu 2O 7, and its high-pressure oxygen-annealed samples were refined by means of the Rietveld method for neutron-powder-diffraction data. The as-prepared sample (non-superconducting) has neither oxygen defect nor carbonate defect in the structure. Noticeable absence of oxygen atoms and carbonate groups are detected for the annealed (superconducting) sample. It is suggested that hole doping is achieved during high-pressure oxygen annealing by the release of some CO 3 groups and by the introduction of oxygen atoms into the vacant ‘apical’ oxygen site, when the CO 3 group is not present.
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