Pressure-temperature phase diagram of antiferromagnetism and superconductivity in CeRhIn 5 and CeIn 3 : 115 In − NQR study under pressure

We report the pressure $(P)$-temperature $(T)$ 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 N\'eel temperature ${T}_{N}$ is reduced at $Pg~1.23\mathrm{GPa}$ with an emergent pseudogap behavior. In ${\mathrm{CeIn}}_{3},$ the localized magnetic character is robust against the application of pressure up to $P\ensuremath{\sim}1.9\mathrm{GPa},$ 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.