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Oxygen in the Possible Role of Mediator of Pairing

For an oxygen atmosphere it has been pointed out that even in conventionally prepared YBa 2 Cu 3 O 6+x samples T C may be increased. In addition resistivity versus temperature curves exhibit anomalies when the samples have been annealed in oxygen at 343 K for sufficiently long time. This effect is distinguished from the increase of T C when illuminated with a laser beam. An explanation of this effect has been suggested within Jansen-Block model of indirect exchange pairing via oxygen atoms.