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Enhancement of Superconducting Transition Temperature due to the Strong Antiferromagnetic Spin Fluctuations in the Noncentrosymmetric Heavy-Fermion Superconductor<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>CeIrSi</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:math>: A<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi>Si</mml:mi><mml:mprescripts /><mml:none /><mml:mn>29</mml:mn></mml:mmultiscripts></mml…
We report a $^{29}\mathrm{Si}$ NMR study on the pressure-induced superconductivity (SC) in an antiferromagnetic (AFM) heavy-fermion compound ${\mathrm{CeIrSi}}_{3}$ without inversion symmetry. In the SC state at $P=2.7--2.8\text{ }\text{ }\mathrm{GPa}$, 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 …