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High temperature superconducting materials have been known since thepioneering work of Bednorz and Mueller in 1986. While the microscopic mechanismresponsible for high Tc superconductivity is still debated, most materialsshowing high Tc contain highly electronic polarizable ions, suggesting that themechanism driving high Tc superconductivity can be related to the ionelectronic polarizability in high Tc materials. Here we show that a free chargecarrier polarizes the ions surrounding it and the total electrical potentialgenerated by the charge carrier itself and the polarized ions becomesattractive in some regions of space. Our results on bulk FeSe, monolayer FeSeon SrTiO3 and La2CuO4 are in excellent agreement with the experiments. The factthat the electronic polarizability explains correctly and quantitatively thesuperconductivity parameters: Tc, gap and paring energies of both pnictides andcuprates with similar polarizability parameters, suggests that the same modelmay be applicable to other material systems within these groups as well asother high Tc groups.

Electronic Polarizability Induced Cooper-like Pairing and Energy Gap in High-Tc superconductors