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We report a genuine phase diagram for a disorder-free CuO_2 plane based onthe precise evaluation of the local hole density (N_h) by site-selective Cu-NMRstudies on five-layered high-Tc cuprates. It has been unraveled that (1) theantiferromagnetic metallic state (AFMM) is robust up to N_h=0.17, (2) theuniformly 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=0.15 and T=75 K, (4) Tc is maximum close to aquantum critical point (QCP) at which the AFM order collapses, suggesting theintimate relationship between the high-Tc SC and the AFM order. The resultspresented here strongly suggest that the AFM interaction plays the vital roleas the glue for the Cooper pairs, which will lead us to a genuine understandingof why the Tc of cuprate superconductors is so high.

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