High Tc as a consequence of structure deformation

Abstract

Based on the experimental fact that doped perovskite structures behave as a system of energetically independent thin layers we developed a theoretical model for a single layer behaviour. It was shown that electron and phonon spectra are functions of azimuthal angle which in turn gives the specific relations for Tc which on the other hand differs significantly from the corresponding value in the BCS theory. The crucial fact, which allows the solution of this equation with high Tc, is the electron-electron interaction constant which in a thin doped layer is for an order or two orders of magnitude greater than the same interaction constant in the ideal infinite structure. © 1991.