Data are presented to show that the phenomenon of Cooper-pairing in high-temperature ceramic oxide superconductors is a consequence of the perturbation by an asymmetric local internal electric field of outer shell oxygen electrons so as to create short-lifetime charge transfer excitations or virtual excitons. In order to establish the excitation, the principal cation of the superconducting structure must be a multivalent transition metal ion. Due to constraints to achieve perfect diamagnetism and not interfere with spin-spin pairing, this multivalent ion must also be diamagnetic in its metallic atomic state [through which it passes 1012 times per second (i.e. such as Cu, Bi, Tl, and dopants Sb, Pb, Sn, Ga)]. Our recent computational studies have shown that ultra-thin confinement within specularly reflecting boundaries will cause in high-T_c superconductors an increase in the statistical equilibration time and hence in the excitonic lifetime or the electron-hole recombination time (neutralising the localised positive plasma) and a consequent increase in T_c towards the theoretical limit of the order of 200K Thus at a considerably higher temperature than in bulk ceramic or single crystal superconductors, in the regime of polyatomic confinement there will be a sufficient concentration of localised hole cores of virtual excitons (and sufficient screening to prevent recombination) to sustain the mediation of free electrons to promote net transient electron-electron attraction, leading in some oppositely spinning electrons (of opposite linear momentum) to Cooper-pairing.
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