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

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.

4 pages, 4 figures, to be published in Phys.Rev.B

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• A New Heavy-Fermion Superconductor CeIrIn5: Relative of the Cuprates?
• Unique Spin Dynamics and Unconventional Superconductivity in the Layered Heavy Fermion Compound CeIrIn_5:NQR Evidence
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• Pressure-induced unconventional superconductivity in the heavy-fermion antiferromagnet CeIn3: An 115In-NQR study under pressure
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• Pressure-driven 4$f$ localized-itinerant crossover in heavy fermion compound CeIn${}_3$: A first-principles many-body perspective
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