Physics – Condensed Matter – Superconductivity
Scientific paper
2004-12-22
Phys.Rev.Lett. 94, 037007 (2005)
Physics
Condensed Matter
Superconductivity
4pages, 4figures, accepted for publication in Phys. Rev. Lett
Scientific paper
10.1103/PhysRevLett.94.037007
We report on a pressure($P$)-induced evolution of superconductivity and spin correlations in CeIrIn$_5$ via the $^{115}$In 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, $T_{\rm c}$ increases to $T_{\rm c}$ = 0.8 K that is twice $T_{\rm c}$($P$ = 0 GPa), in the background of Fermi liquid state. This is in sharp contrast with the previous case in which negative, chemical pressure (replacing Ir with Rh) enhances magnetic interaction and increases $T_{\rm c}$. Our results suggest that multiple mechanisms work to produce superconductivity in the same compound CeIrIn$_5$.
Kan Hiroki
Kawasaki Shinji
Kitaoka Yoshio
Onuki Yoshichika
Shishido Hiroaki
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