LAUSR

Abstract The microscopic theory, has been established by considering a Hamiltonian, comprises the contribution of electron, contribution due to phonons, linear coupling between electron and phonons, anharmonicities and defects, successfully explains the spectacular behavior of the various superconducting properties in high-Tc superconductors (HTSCs). The Green's function (GF), renormalized energies, energy line widths, and shifts are described for polarons and phonons, followed by the derivation of the expressions for the density of states, crystal energy, heat capacity, superconducting gap, and superconducting gap equation. The obtained results are observed as the function of temperature, Fermi energy, and renormalized and perturbed mode electron and phonon energy. The YBa2Cu3O7−δ cuprate has been hired for numerical analysis and to examine the impact of different inter-ionic interactions in layered HTSCs, the modified BMH (Born-Mayer-Huggins) potential has been considered. The phenomenal agreement between the evaluated and experimental results has been speculated. The presence of electron-phonon coupling constant is an important feature of the theory, lead to evaluation of results in various coupling regimes for HTSCs, and is found that the strong coupling is accountable for obtaining high transition temperature.