Multigap Superconductivity in Y2C3: A 13C-NMR Study
A. Harada, S. Akutagawa, Y. Miyamichi, H. Mukuda, Y. Kitaoka, J. Akimitsu
Abstract
We report on the superconducting (SC) properties of Y2C3 with a relatively high transition temperature T c=15.7 K investigated by 13C nuclear-magnetic-resonance (NMR) measurements under a magnetic field. The 13C Knight shift has revealed a significant decrease below T c, suggesting a spin-singlet superconductivity. From an analysis of the temperature dependence of the nuclear spin-lattice relaxation rate 1/T1 in the SC state, Y2C3 is demonstrated to be a multigap superconductor that exhibits a large gap 2Δ/k BT c=5 at the main band and a small gap 2Δ/k BT c=2 at other bands. These results have revealed that Y2C3 is a unique multigap s-wave superconductor similar to MgB2.
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