Abstract
Plateaus observed, with several cuprates, in the dependence of critical temperatures on oxygen content are analyzed on the basis of indirect-exchange Cooper-pair formation via oxygen anions (oxygen-mediated superconductivity), with emphasis on recent experimental results by Li et al. (1994) for Bi 2Sr 2CaCu 2O 8+ x . It is shown that these results can be quantitatively explained in the framework of the indirect-exchange formalism. The plateau structure is found to arise as a compensating effect on T c from hole doping and a change in density of oxygen anions in (or near) the CuO 2 layers. The observed steep decrease of T C in underdoped samples is ascribed to a rapid loss of macroscopic phase coherence with decreasing oxygen content. Extrapolating the analysis to the double-plateau (“chair”) structure of T C( x) in YBa 2Cu 3O 7− x , the origin of the first (60 K) plateau is similar to that in the Bi-compound, whereas the increase to T C ≈ 90 K is due to participation by the basal (chain) plane in superconductivity.
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