Superconductivity in non-centrosymmetric YPtBi under pressure.

We report a high-pressure single-crystal study of the noncentrosymmetric superconductor YPtBi (Tc=0.77 K). Magnetotransport measurements show a weak metallic behavior with a carrier concentration n≃2.2×1019 cm−3. Resistivity measurements up to p=2.51 GPa reveal superconductivity is promoted by pressure. The reduced upper critical field Bc2(T) curves collapse onto a single curve, with values that exceed the model values for spin-singlet superconductivity. The Bc2 data point to an odd-parity component in the superconducting order parameter, in accordance with predictions for noncentrosymmetric superconductors.