Effect of Biexciton on Cooper Pairing in High Tc Superconductors

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In this paper, we have modified the Cooper theory by considering a biexcitonic attractive interaction for high Tc superconductors. We have developed an expression for (2Δ/KBTc) as a function of phonon and biexciton mediated coupling constants. For the sake of simplicity, we use a two-square-well potential model (electron–phonon and electron–biexciton). The calculated values of (2Δ/KBTc) show good agreement with experimental values.

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