115In-NQR evidence for unconventional superconductivity in CeIn3 under pressure
Abstract
We report evidence for unconventional superconductivity in CeIn3 at a pressure P = 2.65 GPa above critical pressure (Pc ~ 2.5 GPa) revealed by the measurements of nuclear-spin-lattice-relaxation time (T1) and ac-susceptibility (ac-chi). Both the measurements of T1 and ac-chi have pointed to a superconducting transition at Tc = 95 mK, which is much lower than an onset temperature Tonset = 0.15 K at zero resistance. The temperature dependence of 1/T1 shows no coherence peak just below Tc, indicative of an unconventional nature for the superconductivity induced in CeIn3.
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