New phase diagram of ideally flat CuO$_{2}$ plane: Cu-NMR study in Five-layered Cuprates

We report a systematic Cu-NMR study on Hg-, Tl-,Cu-based five-layered high-Tc cuprates. In underdoped HgBa$_{2}$Ca$_{4}$Cu$_{5}$O$_{y}$ (Hg-1245) with a Tc=72 K, the AFM order is detected with 0.1$\mu _{B}$ even at two outer planes (OP's) that are responsible for the onset of superconductivity (SC). This is the first microscopic evidence for the uniform mixed phase of AF and SC on a single CuO$_{2}$ [1]. Recently we found AFM insulating state at low temperatures in disordered fivelayered cuprate Cu-1245, whereas the carrier densities are similar to Hg-1245(OPT) where the AFM metallic state are realized in IP's[2]. This finding reinforces the phase diagram in which the AFM metallic phase exists between AFM insulator and SC states for the case of ideally-flat CuO$_{2}$ plane without disorder. [1] Mukuda et al., Phys. Rev. Lett. 96,087001 (2006) [2] Mukuda et al., J. Phys. Soc. Jpn., 75, No.12 (2006)