Unconventional Superconductivity in Heavy-Fermion Systems

We review the studies on the emergent phases of superconductvity and magnetism in the f -electron derived heavy-fermion (HF) systems by means of the nuclear-quadrupole-resonance (NQR) under pressure. These studies have unraveled a rich variety of the phenomena in the ground state of HF systems. In this article, we highlight the novel phase diagrams of magnetism and unconventional superconductivity (SC) in CeCu 2 Si 2 , HF antiferromagnets CeRhIn 5 , and CeIn 3 . A new light is shed on the difference and common features on the interplay between magnetism and SC on the magnetic criticality.