The correlation amplitude for the quasi-particles in high Tc superconductors has been deduced. From this amplitude,
the maximum critical transition temperature has been calculated. The
assumption, which has been made is that, the superconductivity is due to
condensation of electron pairs, which may be in a parallel spin-state, an antiparallel
spin-state, or a mixture of the two states. It has been established that the
maximum transition temperature in the optical phonon frequency is Tc = 262.6 K irrespective of the state of the electron
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