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J. Phys. Soc. Jpn. 76 (2007) 051001 (15 pages)  |Next Article|  |Table of Contents|
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Frontiers of Novel Superconductivity in Heavy Fermion Compounds

Unconventional Pairing States in Heavy-Fermion Superconductors Studied by the NQR/NMR Experiments

Yoshio Kitaoka, Hidekazu Mukuda, Mitsuharu Yashima, and Atsushi Harada

Department of Materials Engineering Science, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531

(Received October 31, 2006; Accepted January 30, 2007; Published May 10, 2007)

We review the studies on the unconventional superconducting pairing states and their relevance with magnetism in the f-electron derived heavy-fermion (HF) systems by means of nuclear-magnetic-resonance (NMR) and nuclear-quadrupole-resonance (NQR). These studies have unraveled a rich variety of the phenomena in the ground state of HF systems. In this article, we address an intimate relationship between the onset of strong-coupling superconductivity (SC) and critical magnetic fluctuations emerging in the vicinity of quantum critical point (QCP). Furthermore, we focus on the novel phase diagram of the HF antiferromagnet CeRhIn5 under pressure which is characterized by the tetracritical point separating the pure antiferromagnetism (AFM) phase, the AFM+SC uniformly coexisting phase, and the paramagnetic SC phase. A comparison is also presented on the AFM+SC uniformly coexisting phase in high-temperature superconductors as the function of carrier doping. As a consequence, we raise a question; Do we need a bosonic glue to pair electrons in these superconductors? Finally, we address a possible origin of the novel SC in the itinerant ferromagnet UGe2, which is mediated by ferromagnetic spin-density fluctuations relevant with the first-order transition inside the ferromagnetic states. ©2007 The Physical Society of Japan

URL: http://jpsj.ipap.jp/link?JPSJ/76/051001/
DOI: 10.1143/JPSJ.76.051001


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