Abstract
The assumptions of the parabolic model are questioned. These assumptions pertain to an expectation of universal T c optima for cuprates at an “experimental” hole concentration of p = 0.16n, where n is the number of CuO2 planes. This model was developed based on the T c maximum for La2 − x Sr x CuO4 at x = 0.16. However, a variety of cases are presented for higher optimal hole concentrations, including La2CuO4.16, where it is twice as high. Also, the success of a charge order model in universally predicting optimal T c at formal stoichiometric holes, h = 0.5n, suggests a need for expansion of the parabolic model. By quantitatively taking into account the deleterious effect of the blocking layer, optimal T c can be absolutely calibrated at a uniform optimal charge order with alternate holes.
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