Unconventional Superconductivity in Heavy Fermion Systems

Abstract

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.

15 pages, 13 figures, to appear in J. Phys. Soc. JPN, 74, No.1 (2005), special issue "Kondo Effect- 40 Years after the Discovery"

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• Antiferromagnetic Phases in the Fulde-Ferrell-Larkin-Ovchinnikov State of CeCoIn_5
• Novel phase diagram for antiferromagnetism and superconductivity in pressure-induced heavy-fermion superconductor Ce${}_2$RhIn${}_8$ probed by In-NQR
• Criterion for weak spin-orbit coupling in heavy-fermion superconductivity: A numerical renormalization-group study