Abstract
It is shown that, as a result of heating YBa2Cu3Ox samples at temperatures in the range of 200–450°C with subsequent isothermal treatment and cooling, the correlation between concentrations of oxygen atoms and vacancies in the CuOx−6-plane changes, and at x=6.83, 6.80, 6.75 and 6.67 ordered states arise. Ordering is distinctly seen in curves P(x) (the volume of superconducting phase versus x) and σ(x) (conductivity at room temperature versus x). The analysis of the correlation between these characteristics allows one to substantiate a concept of a superconducting cluster, the structure of which approaches the ordered state. The charge carrier concentration in it is not far from the value corresponding to full filling of the bands.
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