Phase diagram of La2-xMxCuO4 as the key to understanding the nature of high-Tc superconductors
Lebedev Physical Institute, Russian Academy of Sciences, Leninsky prosp. 53, Moscow, 119991, Russian Federation
Results of high-Tc superconductivity studies are analyzed using the authors’ model, which assumes that the interaction of electrons with two-site negative-U centers (due to charged dopant localization near impurity ions) is responsible for many anomalous properties, and indeed the very superconductivity, of high-T c superconductors. It is shown that the basic properties of high-Tc superconductors and the details of the superconducting and magnetic phase diagrams ofLa2-xMxCuO4 (M=Ba, Sr) can be explained by this model.