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Crystallographic and superconducting properties of the fully gapped noncentrosymmetric 5<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>d</mml:mi></mml:mrow></mml:math>-electron superconductors Ca<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>M</mml:mi></mml:mrow></mml:math>Si<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow /><mml:mrow><mml:mn>3</mml:mn…
We report crystallographic, specific heat, transport, and magnetic properties of the recently discovered noncentrosymmetric 5$d$-electron superconductors CaIrSi${}_{3}$ (${T}_{\mathrm{c}}=3.6$ K) and CaPtSi${}_{3}$ (${T}_{\mathrm{c}}=2.3$ K). The specific heat suggests that these superconductors are fully gapped. The upper critical fields are less than 1 T, consistent with limitation by conventional orbital depairing. High, …