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By employing a series of experimental techniques, we provide clear evidencethat CaPtAs represents a rare example of a noncentrosymmetric superconductorwhich simultaneously exhibits nodes in the superconducting gap and brokentime-reversal symmetry (TRS) in its superconducting state (below $T_c$$\approx$ 1.5 K). Unlike in fully-gapped superconductors, the magneticpenetration depth $\lambda(T)$ does not saturate at low temperatures, butinstead it shows a $T^2$-dependence, characteristic of gap nodes. Both thesuperfluid density and the electronic specific heat are best described by atwo-gap model comprising of a nodeless gap and a gap with nodes, rather than bysingle-band models. At the same time, zero-field muon-spin spectra exhibitincreased relaxation rates below the onset of superconductivity, implying thatTRS is broken in the superconducting state of CaPtAs, hence indicating itsunconventional nature. Our observations suggest CaPtAs to be a new remarkablematerial which links two apparently disparate classes, that of TRS-breakingcorrelated magnetic superconductors with nodal gaps and the weakly-correlatednoncentrosymmetric superconductors with broken TRS, normally exhibiting only afully-gapped behavior.

Simultaneous Nodal Superconductivity and Time-Reversal Symmetry Breaking in the Noncentrosymmetric Superconductor CaPtAs