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Theory of High-Temperature Superconductivity in Cuprates

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Abstract

We propose a microscopic theory of superconductivity for systems with strong electron correlations such as cuprates in the framework of the extended Hubbard model where the intersite Coulomb repulsion and electron-phonon interaction (EPI) are taken into account. The Dyson equation for the normal and pair Green functions for the Hubbard operators (HOs) is derived. Due to the unconventional commutation relations for the HOs, a specific kinematical interaction of electrons with spin and charge fluctuations with a large coupling constant of the order of the kinetic energy of electrons W emerges that results in the d-wave pairing with high- T c . Superconductivity can be suppressed only for a large intersite Coulomb repulsion \(V \gtrsim W\). Isotope effect on T c caused by electron-phonon interaction is weak at optimal doping and increases at low doping. The kinematical interaction is absent in the spin-fermion models and is lost in the slave-boson (-fermion) models treated in the mean-field approximation.

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Plakida, N.M., Oudovenko, V.S. Theory of High-Temperature Superconductivity in Cuprates. J Supercond Nov Magn 29, 1037–1042 (2016). https://doi.org/10.1007/s10948-016-3379-4

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