Genuine Phase Diagram of Homogeneously Doped CuO2 Plane in High-Tc Cuprate Superconductors

We report a genuine phase diagram for a disorder-free CuO2 plane based oil the precise evaluation of the local hole density (N-h) by site-selective Cu-NMR studies oil five-layered high-T-c cuprates. It has been unraveled that (1) the antiferromagnetic metallic state (AFMM) is robust up to N-h approximate to 0.17, (2) the uniformly mixed phase of superconductivity (SC.) and AFMM is realized at N-h <= 0.17, (3) the tetracritical point for the AFMM/(AFMM+SC)/SC/PM (paramagnetism) phases may be present at N-h approximate to 0.15 and T approximate to 75 K, (4) T-c is maximum close to a quantum critical point (QCP) at which the AFM order collapses, Suggesting the intimate relationship between the high-T-c SC and the AFM order. The results presented here strongly suggest that the AFM interaction plays the vital role as the glue for the Cooper pairs, which will lead us to a genuine understanding of why the T-c of cuprate Superconductors is so high.