Unconventional Superconductivity in Heavy-Fermion Systems

Abstract

We review the studies on the emergent phases of superconductvity and\nmagnetism in the $f$-electron derived heavy-fermion (HF) systems by means of\nthe nuclear-quadrupole-resonance (NQR) under pressure. These studies have\nunraveled a rich variety of the phenomena in the ground state of HF systems. In\nthis article, we highlight the novel phase diagrams of magnetism and\nunconventional superconductivity (SC) in CeCu$_2$Si$_2$, HF antiferromagnets\nCeRhIn$_5$, and CeIn$_3$. A new light is shed on the difference and common\nfeatures on the interplay between magnetism and SC on the magnetic criticality.\n