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We report evidence that the metallic phase in high Tc cuprate superconductorsresults from an instability of the quasi 2D-electron gas at densities lower orlarger than the critical density for the formation of a Wigner polaroniccrystal. The electron gas undergoes a microscopic phase separation between 1) apolaron gas with density 1/8 at the Wigner localization limit and 2) a Fermiliquid confined in a superlattice of quantum stripes. The 2D-polaron gascondenses into a paired unidimensional Wigner charge density wave (CDW) atT<T*~1.4 Tc. Below the superconducting critical temperature the two types ofcarriers are coupled, and the pairing mechanism involves virtual polaron pairs.This mechanism drives the condensate to the maximum critical temperature for aFermi liquid. In addition the pairing model proposed here correctly predictsthe dependence of Tc on the condensate density ns/m* (Uemura plot), and thevariation of the isotope effect.

The Coupling of a Wigner Polaronic Charge Density Wave with a Fermi  Liquid Arising from the Instability of a Wigner Polaron Crystal: a Possible  Pairing Mechanism in High Tc Superconductors