Theoretical Investigation Of Assocative Superconducting Model Of Phonon And Exciton For Superconductor YBa₂Cu₃O_7-δ

This article uses the associative superconducting model between electron and phonon with exciton. From the self-energy formula of superconducting system: .Eliashberg integration formula of energy gap when T = Tc is rewritten. Using the model of three constant piecesof real energy gap : (cutting frequency of phonon); (frequency of exciton); , the formula of criticaltemperature of high Tc -oxide superconductor YBa2Cu3O7-δ is deduced. The coupling effective spectrum of electron and phonon with exciton is taken as . It is shown through numericalcalculation that when =0. 5ev and Tc of YBa2Cu3O7_δ is 106K and its...