Abstract
Effects of paramagnetic impurities on the superconducting transition of noncentrosymmetric ${\mathrm{LaNiC}}_{2}$ have been studied by Ce substitution for La up to 3 at.%. With the substitution the superconducting transition temperature ${T}_{\mathrm{c}}\ensuremath{\sim}2.8$ K of the pure system decreases dramatically, and disappears with Ce just above 2 at.%. This intense suppression of ${T}_{\mathrm{c}}$ with the Ce substitution can be explained by the Abrikosov-Gor'kov theory for conventional $s$-wave superconductors with localized magnetic moments. These results, together with a quite small depression of ${T}_{\mathrm{c}}$ with nonmagnetic Y impurities, strongly suggest that ${\mathrm{LaNiC}}_{2}$ is a BCS superconductor with a full superconducting energy gap, not an unconventional one with a nodal gap.
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