Superexchange interaction and magnetic moment in antiferromagnetic high-TcTc cuprate superconductors

We report a 63Cu-NMR study on underdoped Hg-based five-layered (n = 5) compounds HgBa2Ca4Cu5O12+y (Hg-1245) with Tc=82K and 92 K, and review the previous Cu-NMR results on the various multilayered cuprates. On the basis of extensive experiments on n=5n=5 compounds, we have unraveled that (1) the antiferromagnetic metallic (AFMM) phase is robust up to the carrier-density Nh∼0.17Nh∼0.17, (2) the uniformly mixed state of superconductivity (SC) and AFMM is realized at least in 0.14