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^{115}In-NQR evidence for unconventional superconductivity in CeIn_3 under pressure

S. Kawasaki·T. Mito·Y. Kawasaki·G. -q. Zheng·Y. Kitaoka·H. Shishido·S. Araki·R. Settai·Y. Onuki
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Abstract

We report evidence for unconventional superconductivity in CeIn_3 at a pressure P = 2.65 GPa above critical pressure (P_c ~ 2.5 GPa) revealed by the measurements of nuclear-spin-lattice-relaxation time (T_1) and ac-susceptibility (ac-chi). Both the measurements of T_1 and ac-chi have pointed to a superconducting transition at T_c = 95 mK, which is much lower than an onset temperature T_{onset} = 0.15 K at zero resistance. The temperature dependence of 1/T_1 shows no coherence peak just below T_c, indicative of an unconventional nature for the superconductivity induced in CeIn_3.

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S. Kawasaki, T. Mito, Y. Kawasaki, G. -q. Zheng, Y. Kitaoka, H. Shishido, S. Araki, R. Settai, Y. Onuki. 2002-08-11. ^{115}In-NQR evidence for unconventional superconductivity in CeIn_3 under pressure. https://doi.org/10.1103/physrevb.66.054521

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