Abstract
We report measurements of the temperature dependence of the magnetic penetration depth in different-quality polycrystalline samples of noncentrosymmetric LaNiC2 down to 0.05 K. This compound has no magnetic phases and breaks time-reversal symmetry. In our highest-quality sample, we observe a T2 dependence below 0.4Tc, indicative of nodes in the energy gap. We argue that previous results suggesting conventional s-wave behavior may have been affected by magnetic impurities.
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