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We report on a pressure($P$)-induced evolution of superconductivity and spincorrelations in CeIrIn$_5$ via the $^{115}$In nuclear-spin-lattice-relaxationrate measurements. We find that applying pressure suppresses dramatically theantiferromagnetic fluctuations that are strong at ambient pressure. At $P$ =2.1 GPa, $T_{\rm c}$ increases to $T_{\rm c}$ = 0.8 K that is twice $T_{\rmc}$($P$ = 0 GPa), in the background of Fermi liquid state. This is in sharpcontrast with the previous case in which negative, chemical pressure (replacingIr with Rh) enhances magnetic interaction and increases $T_{\rm c}$. Ourresults suggest that multiple mechanisms work to produce superconductivity inthe same compound CeIrIn$_5$.Comment: 4pages, 4figures, accepted for publication in Phys. Rev. Let

physical review letters

Enhancing the Superconducting Transition Temperature of the Heavy Fermion Compound<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow><mml:mi mathvariant="normal">C</mml:mi><mml:mi mathvariant="normal">e</mml:mi><mml:mi mathvariant="normal">I</mml:mi><mml:mi mathvariant="normal">r</mml:mi><mml:mi mathvariant="normal">I</mml:mi><mml:mi mathvariant="normal">n</mml:mi></mml:mrow><mml:mn>5</mml:mn></mml:msub></mml:math>in the Absence of Spin Correlations

Enhancing the Superconducting Transition Temperature of the Heavy Fermion CompoundCeIrIn5in the Absence of Spin Correlations