MOTT INSULATOR HIGH T-C BIPOLARONIC SUPERCONDUCTOR TRANSITION IN CUPRATES

All 'undoped' cuprates are antiferromagnetic Mott insulators. We argue that with doping they remain insulators including the 'overdoped' sam ples. Hence, there is no clear dividing Line between non-metallic cupr ates and high-temperature superconductors. Based on the generic Hamilt onian including the electron-phonon interaction and the direct Coulomb repulsion the ground state of doped cuprates is shown to be a charged 2e Bose liquid of small bipolarons. A theory of the normal state tran sport of copper oxides is developed. The temperature dependence of the resistivity and of the Hall effect agrees remarkably well with the ex perimental data in La2-xSrxCuO4 for the entire temperature regime incl uding unusual 'logarithmic' low-temperature region. The violation of K ohler's rule in magnetoresistivity is explained. The resistive and the rmodynamic superconducting transitions in a magnetic field are quantit atively described.