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We report on the superconducting (SC) properties of Y$_2$C$_3$ with arelatively high transition temperature $T_{\rm c}=15.7$ K investigated by$^{13}$C nuclear-magnetic-resonance (NMR) measurements under a magnetic field.The $^{13}$C Knight shift has revealed a significant decrease below $T_{\rmc}$, suggesting a spin-singlet superconductivity. From an analysis of thetemperature dependence of the nuclear spin-lattice relaxation rate $1/T_1$ inthe SC state, Y$_2$C$_3$ is demonstrated to be a multigap superconductor thatexhibits a large gap $2\Delta/k_{\rm B}T_{\rm c}=5$ at the main band and asmall gap $2\Delta/k_{\rm B}T_{\rm c}=2$ at other bands. These results haverevealed that Y$_2$C$_3$ is a unique multigap s-wave superconductor similar toMgB$_2$.Comment: 4 pages, 5 figure

Multigap Superconductivity in Y2C3: A 13C-NMR Study

Multigap Superconductivity in Y₂C₃: A ¹³C-NMR Study