2008/01/25 by H. Mukuda, Hidekazu Mukuda, H. Fujii +12 · 96 citations
Materials Science · Physics and Astronomy · #Antiferromagnetism #Condensed matter physics #Fermi liquid theory #Fermion #Heavy fermion #Iron-based superconductors research #Phase transition #Physics #Physics of Superconductivity and Magnetism #Point reflection #Quantum critical point #Quantum mechanics #Quantum phase transition #Rare-earth and actinide compounds #Spin (aerodynamics) #Superconductivity #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevlett.100.107003
published in Physical Review Letters 100(10), 107003 (American Physical Society) · 4 pages, 5 figures, To be published in Phys. Rev. Lett
arxiv created 2008/01/25 · openalex publication_date 2008/03/14 · arxiv updated 2012/03/22 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We report a (29)Si NMR study on the pressure-induced superconductivity (SC) in an antiferromagnetic (AFM) heavy-fermion compound CeIrSi(3) without inversion symmetry. In the SC state at P = 2.7-2.8 GPa, the temperature (T) dependence of the nuclear-spin lattice relaxation rate 1/T(1) below T(c) exhibits a T(3) behavior without any coherence peak just below T(c), revealing the presence of line nodes in the SC gap. In the normal state, 1/T(1) follows a square root T-like behavior, suggesting that the SC emerges under the non-Fermi-liquid state dominated by AFM spin fluctuations enhanced around a quantum critical point. The reason why the maximum T(c) in CeIrSi(3) is relatively high among the Ce-based heavy-fermion superconductors may be the existence of the strong AFM spin fluctuations. We discuss the comparison with the other Ce-based heavy-fermion superconductors.