Mechanisms and models of high temperature superconductors

Abstract

Mechanisms and models of high temperature superconductors are discussed with an emphasis on a selfconsistent description both normal and superconducting states in these materials. It is shown that there is a strong support for a Fermi-liquid based approach to these systems both from theoretical investigations and experimental evidences. Moreover it is claimed that the electronic properties of these materials at moderate and high energies of excitations can be well described in terms of the usual band - structure approach like for conventional metals. It is demonstrated that “noncanonical” Fermi-liquid behavior of these systems in a normal state can be easily explained in terms of the usual strong electron-phonon interaction. It is also shown that the same electron-phonon interaction can explain the values of T c and some peculiarities of superconducting state.