A correlation has been found between the critical temperature of Fe-based HT superconductors and the positions of the Fe atoms next to the doping element positions. This correlation allows for the prediction of Tc from crystal lattice constants and explains the fractional numbers of the optimum doping concentrations. The equations found indicate that all HTSC share a common resonance mechanism between the de Broglie wavelength of the charge carriers and characteristic directions in the crystal lattice. The theoretically derived coupling constant differs from the experimental results by less than 0.02%.

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