We report on an intimate interplay between superconductivity (SC) and antiferromagnetism (AFM) in CeRhIn
5 under pressure and multilayered high-T
c cuprates via the NMR/NQR measurements. The experiments on CeRhIn
5 has revealed that a first-order quantum phase transition (QPT) occurs around P
c-2 GPa from the AFM to the paramagnetism in the superconducting regime and the novel superconducting nature in the coexistent phase of AFM and SC. The site selective Cu-NMR study demonstrated that the under-doped five-layered high-T
c cuprate, HgBa
2Ca
4Cu
5O
12+δ with T
c=72 K can uniformly coexist on the microscopic level with the AFM. This is the first microscopic evidence for the uniform mixed phase of AFM and SC on a single CuO
2 plane in a simple environment without any vortex lattice and/or stripe order.
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