  Nuclear magnetic resonance (NMR) measurements on the $^{195}$Pt nucleus in an
aligned powder of the moderately heavy-fermion material U2PtC2 are consistent
with spin-triplet pairing in its superconducting state. Across the
superconducting transition temperature and to much lower temperatures, the NMR
Knight shift is temperature independent for field both parallel and
perpendicular to the tetragonal c-axis, expected for triplet equal-spin pairing
superconductivity. The NMR spin-lattice relaxation rate 1/T$_1$, in the normal
state, exhibits characteristics of ferromagnetic fluctuations, compatible with
an enhanced Wilson ratio. In the superconducting state, 1/T$_1$ follows a power
law with temperature without a coherence peak giving additional support that
U$_2$PtC$_2$ is an unconventional superconductor. Bulk measurements of the
AC-susceptibility and resistivity indicate that the upper critical field
exceeds the Pauli limiting field for spin-singlet pairing and is near the
orbital limiting field, an additional indication for spin-triplet pairing.

Superconductivity;Strongly Correlated Electrons