We report on a pressure- (P-)induced evolution of superconductivity and spin correlations in CeIrIn5 via the 115In 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, Tc increases to T c = 0.8 K, which is twice Tc (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 Tc. Our results suggest that multiple mechanisms work to produce superconductivity in the same compound CeIrIn 5.
ASJC Scopus subject areas
- Physics and Astronomy(all)