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We report on systematic evolutions of antiferromagnetic (AFM) spinfluctuations and unconventional superconductivity (SC) in heavy-fermion (HF)compounds CeRh$_{1-x}$Ir$_{x}$In$_5$ via $^{115}$Innuclear-quadrupole-resonance (NQR) experiment. The measurements of nuclearspin-lattice relaxation rate $1/T_1$ have revealed the marked development ofAFM spin fluctuations as a consequence of approaching an AFM ordered state withincreasing Rh content. Concomitantly the superconducting transition temperature$T_{\rm c}$ and the energy gap $\Delta_0$ increase drastically from $T_{\rm c}= 0.4$ K and $2\Delta_0/k_{\rm B}T_{\rm c} = 5$ in CeIrIn$_5$ up to $T_{\rm c}= 1.2$ K and $2\Delta_0/k_{\rm B}T_{\rm c} = 8.3$ inCeRh$_{0.3}$Ir$_{0.7}$In$_5$, respectively. The present work suggests that theAFM spin fluctuations in close proximity to the AFM quantum critical point areindeed responsible for the onset of strong-coupling unconventional SC with theline node in the gap function in HF compounds.Comment: 4pages,5figures,to appear in Phys. Rev. Let

physical review letters

Enhancing the Superconducting Transition Temperature of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>CeRh</mml:mi><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mi>Ir</mml:mi><mml:mi>x</mml:mi></mml:msub><mml:msub><mml:mi>In</mml:mi><mml:mn>5</mml:mn></mml:msub></mml:math>due to the Strong-Coupling Effects of Antiferromagnetic Spin Fluctuations: An<mml:math xmlns:mml="http://www.w3.org/1998/Math/…

Enhancing the Superconducting Transition Temperature ofCeRh1−xIrxIn5due to the Strong-Coupling Effects of Antiferromagnetic Spin Fluctuations: An