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The additional long range order parameter that competes with the high Tcsuperconductivity long range order is identified as an electronic crystal ofpseudo Jahn-Teller polarons beyond the critical value of the electron latticeinteraction. We show that the region of quantum critical fluctuations in thetwo variables phase diagram of cuprates: the doping (delta) and the chemicalpressure (i.e., the tolerance factor, or the average ionic radius of A-sitecations) can be measured via the microstrain (eta) of the Cu-O length in theCuO2 lattice. The fluctuating order in the proximity of the microstrain quantumcritical point that competes with the superconducting long range order is thepolaron electronic crystalline phase called a Wigner polaron crystal and thevariation of the spin gap energy as a function of microstrain provides a strongexperimental support for this proposal.

The Feshbach resonance and nanoscale phase separation in a polaron liquid near the quantum critical point for a polaron Wigner crystal