PLASMON MECHANISM OF HIGH-TEMPERATURE SUPERCONDUCTIVITY IN COPPER METAL-OXIDE COMPOUNDS

In a framework of the standard theory of superconductivity in the inte rmediate coupling approximation for the model of layered metal with th e quasi 2D electron spectrum and narrow band near the Fermi level the plasmon mechanism is analyzed for Cooper pairing of nearly free light current carriers in the wide 2D band due to the exchange with virtual quanta of low frequency collective charge density excitations of nearl y localized heavy carriers in the narrow 2D band (acoustic plasmons) h ybridized with the dipole-active oxygen vibration modes (optical phono ns) in the whole volume of the Brillouin zone. It is shown that such a mechanism of superconductivity with involving the multi-layered struc ture of copper metal-oxide compounds and multi-particle Coulomb correl ations (similar to the local field effects) can provide the sufficient ly high values of the critical temperatures T(c) for the transition in to superconducting state and describes correctly all principal propert ies of high temperature superconductors, i.e. nonmonotonic T(c) depend ence on the dopant impurity concentration or oxygen content; T(c) enha ncement with the growth of a number n of copper CuO2 layers in the uni t cell of crystal with the tendency to saturation for n greater-than-o r-equal-to 3; anomalies of isotopic oxygen effects, ets.