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Nuclear magnetic resonance (NMR) measurements on the $^{195}$Pt nucleus in analigned powder of the moderately heavy-fermion material U2PtC2 are consistentwith spin-triplet pairing in its superconducting state. Across thesuperconducting transition temperature and to much lower temperatures, the NMRKnight shift is temperature independent for field both parallel andperpendicular to the tetragonal c-axis, expected for triplet equal-spin pairingsuperconductivity. The NMR spin-lattice relaxation rate 1/T$_1$, in the normalstate, exhibits characteristics of ferromagnetic fluctuations, compatible withan enhanced Wilson ratio. In the superconducting state, 1/T$_1$ follows a powerlaw with temperature without a coherence peak giving additional support thatU$_2$PtC$_2$ is an unconventional superconductor. Bulk measurements of theAC-susceptibility and resistivity indicate that the upper critical fieldexceeds the Pauli limiting field for spin-singlet pairing and is near theorbital limiting field, an additional indication for spin-triplet pairing.

Evidence for spin-triplet superconductivity in U$_2$PtC$_2$ from $^{195}$Pt NMR