The little mechanism: A consistent interpretation of high-temperature superconductivity
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We consider an excitonic model in which the electron is localized in a d orbital on a metal site, and the hole is in a linear combination of p orbitals on the surrounding oxygen on a metal with both electron and hole in an insulating LaO, BaO, etc. layer adjacent to a metallic CuO2 or BiO2 plane. Even for rather large effective dielectric constants, some of the excitons are found to be tightly bound and consequently to have sizable transition densities α*e(→x)βh(→x). We calculate the attractive carrier-carrier interaction V(→q), and use it to estimate the superconducting Tc as a function of the parameters in the model. This excitonic mechanism appears to provide a natural and consistent interpretation of high-temperature superconductivity in both the cuprates and bismuthates. © 1989.
author list (cited authors)
Richert, B. A., Schachinger, E., & Allen, R. E.