Superconductivity in non-centrosymmetric YPtBi under pressure

Abstract

We report a high-pressure single-crystal study of the non-centrosymmetric superconductor YPtBi ($T_c=0.77$ K). Magnetotransport measurements show a weak metallic behavior with a carrier concentration $n\simeq 2.2\times 10^{19}$ cm${}^{-3}$. Resistivity measurements up to $p=2.51$ GPa reveal superconductivity is promoted by pressure. The reduced upper critical field $B_{c2}(T)$ curves collapse onto a single curve, with values that exceed the model values for spin-singlet superconductivity. The $B_{c2}$ data point to an odd-parity component in the superconducting order parameter, in accordance with predictions for non-centrosymmetric superconductors.

5 pages, 5 figures; submitted for publication