Abstract
The effects of oxygen deficiency and temperature-induced oxygen atom disordering on the critical temperature ( T c ) of YBa 2Cu 3O 7 − x are presented. Two possible influences are proposed and discussed to explain an extraordinary behaviour of T c , observed in the oxygen-deficient region of the phase. The first influence is the effect of oxygen disordering on the b-axis Cu-O chains, which results in a state characteristic of a set of mutually perpendicular and inequivalently occupied Cu-O chains, which is possibly more favourable for superconductivity. The second is the influence of the Cu-O planes, which exist between the yttrium and the barium-ion layers, the contribution of which on T c may exceed that of the Cu-O chains and, starting at a certain oxygen index, it may become dominating. Estimates on the upper value of T c for 1:2:3 type compounds (165 K) and on the limit of superconductivity in the YBa 2Cu 3O 7 − x phase have been made. They give 6.23, if determined by the oxygen index, or 3 × 10 −3 if determined by the orthorombic distortion parameter p.
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