Pressure-temperature phase diagram of antiferromagnetism and superconductivity in ${\mathrm{CeRhIn}}_5$ and ${\mathrm{CeIn}}_3:$ ${}^{115}\mathrm{In}-\mathrm{NQR}$ study under pressure

We report the pressure $\mathrm{}\left(P\right)\mathrm{}$-temperature $\mathrm{}\left(T\right)\mathrm{}$ phase diagram of antiferromagnetism and superconductivity in ${\mathrm{CeRhIn}}_5$ and ${\mathrm{CeIn}}_3$ revealed by the ${}^{115}\mathrm{In}$ nuclear-spin-lattice-relaxation ${(T}_1)$ measurement. In the itinerant magnet ${\mathrm{CeRhIn}}_5,$ we found that the Néel temperature $T_N$ is reduced at $P>~1.23\mathrm{GPa}$ with an emergent pseudogap behavior. In ${\mathrm{CeIn}}_3,$ the localized magnetic character is robust against the application of pressure up to $P\sim 1.9\mathrm{GPa},$ beyond which the system evolves into an itinerant regime in which the resistive superconducting phase emerges. We discuss the relationship between the phase diagram and the magnetic fluctuations.