Journal
PHYSICAL REVIEW LETTERS
Volume 94, Issue 3, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.94.037007
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We report on a pressure- (P-)induced evolution of superconductivity and spin correlations in CeIrIn5 via the In-115 nuclear-spin-lattice-relaxation rate measurements. We find that applying pressure suppresses dramatically the antiferromagnetic fluctuations that are strong at ambient pressure. At P=2.1 GPa, T-c increases to T-c=0.8 K, which is twice T-c (P=0 GPa), in the background of Fermi-liquid state. This is in sharp contrast to the previous case in which a negative, chemical pressure (replacing Ir with Rh) enhances magnetic interaction and increases T-c. Our results suggest that multiple mechanisms work to produce superconductivity in the same compound CeIrIn5.
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