115In-NQR study of antiferromagnetism and superconductivity in CeRhIn5 and CeIn3 under pressure

Abstract We report the novel phase diagram of superconductivity (SC) and antiferromagnetism (AFM) in heavy-fermion (HF) pressure( P )-induced superconductors CeRhIn 5 and CeIn 5 through nuclear-quadrupole-resonance (NQR) measurements under P . The P -induced superconductivity in CeRhIn 5 coexists with AFM on a microscopic level in P =1.5–1.9 GPa. By contrast, in CeIn 3 , the P -induced phase separation of AFM and paramagnetism (PM) takes place without any trace of a quantum phase transition. The outstanding finding is that SC sets in at both the phases magnetically separated into AFM and PM in P =2.28–2.5 GPa.