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We report crystallographic, specific heat, transport, and magnetic propertiesof the recently discovered noncentrosymmetric 5d-electron superconductorsCaIrSi3 (Tc = 3.6 K) and CaPtSi3 (Tc = 2.3 K). The specific heat suggests thatthese superconductors are fully gapped. The upper critical fields are less than1 T, consistent with limitation by conventional orbital depairing. High,non-Pauli-limited {\mu}0 Hc2 values, often taken as a key signature of novelnoncentrosymmetric physics, are not observed in these materials because thehigh carrier masses required to suppress orbital depairing and reveal theviolated Pauli limit are not present.

Crystallographic and superconducting properties of the fully-gapped noncentrosymmetric 5d-electron superconductors CaMSi3 (M=Ir, Pt)