We present a novel phase diagram for the antiferromagnetism and
superconductivity in Ce2​RhIn8​ probed by In-NQR studies under pressure
(P). The quasi-2D character of antiferromagnetic spin fluctuations in the
paramagnetic state at P = 0 evolves into a 3D character because of the
suppression of antiferromagnetic order for P>PQCP​∼ 1.36 GPa (QCP:
antiferromagnetic quantum critical point). Nuclear-spin-lattice-relaxation rate
1/T1​ measurements revealed that the superconducting order occurs in the P
range 1.36 -- 1.84 GPa, with maximum Tc​∼ 0.9 K around PQCP​∼
1.36 GPa.Comment: 5 pages, 5 figures, submitted to PR