Atomic ordering in the normal and superconducting state characteristics of YBa2Cu3O<i>x</i> HTS oxides
B. Ya. SukharevskiǐPhysicotechnical Institute, Academy of Sciences of the Ukrainian SSR, DonetskI. V. ZhikharevPhysicotechnical Institute, Academy of Sciences of the Ukrainian SSR, DonetskS. I. KhokhlovaPhysicotechnical Institute, Academy of Sciences of the Ukrainian SSR, DonetskG. E. ShatalovaPhysicotechnical Institute, Academy of Sciences of the Ukrainian SSR, DonetskA. Ya. DukaPhysicotechnical Institute, Academy of Sciences of the Ukrainian SSR, DonetskE. O. Tsybul'SkiǐPhysicotechnical Institute, Academy of Sciences of the Ukrainian SSR, DonetskP. MikheenkoPhysicotechnical Institute, Academy of Sciences of the Ukrainian SSR, Donetsk
ABI
Abstract
It is shown that when YBa2Cu3Ox ceramic samples with an initial value x = 6.86 are heated to temperatures in the interval 200–450 °C, held under isothermal conditions, and quenched, the ratio of oxygen to vacancy concentration in the CuOx-6 plane changes and this results in the formation of ordered states for x = 6.83, 6.80, 6.75, and 6.67. The ordering can be seen clearly in the dependences P(x) of the superconducting phase volume and σ(x) of room-temperature conductivity. The correlation between these characteristics enables us to substantiate the concepts about the superconducting cluster with a nearly ordered structure and a carrier concentration close to the value corresponding to the filling of an integral number of bands.
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