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We report a 29Si-NMR study on the pressure-induced superconductivity (SC) inan antiferromagnetic (AFM) heavy-fermion compound CeIrSi3 without inversionsymmetry. In the SC state at P=2.7-2.8 GPa, the temperature dependence of thenuclear-spin lattice relaxation rate 1/T_1 below Tc exhibits a T^3 behaviorwithout any coherence peak just below Tc, revealing the presence of line nodesin the SC gap. In the normal state, 1/T_1 follows a \sqrt{T}-like behavior,suggesting that the SC emerges under the non-Fermi liquid state dominated byAFM spin fluctuations enhanced around quantum critical point (QCP). The reasonwhy the maximum Tc in CeIrSi3 is relatively high among the Ce-basedheavy-fermion superconductors may be the existence of the strong AFM spinfluctuations. We discuss the comparison with the other Ce-based heavy-fermionsuperconductors.

physical review letters

Enhancement of Superconducting Transition Temperature due to the strong  Antiferromagnetic Spin Fluctuations in Non-centrosymmetric Heavy-fermion  Superconductor CeIrSi3 :A 29Si-NMR Study under Pressure