Pressure-Temperature Phase Diagram In Ce2rhin8 Studied By In-Nqr Measurements

We present a phase diagram for the antiferromagnetism and superconductivity in Ce2RhIn8 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 > P-QCP similar to 1.36 GPa (QCP: antiferromagnetic quantum critical point). Nuclear-spin-lattice-relaxation rate 1/T-1 measurements revealed that the superconducting order occurs in the P range 1.36 - 1.84 GPa, with maximum T-c similar to 0.9 K (P-QCP similar to 1.36 GPa).