Physical Picture of High-Tc Superconductivity in Cuprates

A simple physical picture of high-Tc superconductivity of CuO2 planes is proposed. It possesses all characteristic features of HTS, such as a high superconducting transition temperature, the \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$d_{x^{2}-y^{2}}$$\end{document} symmetry of order parameter, and the coexistence of a single-electron Fermi surface and a pseudogap in the normal state. Values of pseudogap are calculated for different doping levels.