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Evidence for Time-Reversal Symmetry Breaking in the Noncentrosymmetric Superconductor<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>LaNiC</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math>
Muon spin relaxation experiments on the noncentrosymmetric intermetallic superconductor ${\mathrm{LaNiC}}_{2}$ are reported. We find that the onset of superconductivity coincides with the appearance of spontaneous magnetic fields, implying that in the superconducting state time-reversal symmetry is broken. An analysis of the possible pairing symmetries suggests only four triplet states compatible …