Superconductivity in materials without spatial inversion symmetry is studied. We show that in contrast to common belief, spin-triplet pairing is not entirely excluded in such systems. Moreover, paramagnetic limiting is analyzed for both spin-singlet and -triplet pairing. The lack of inversion symmetry reduces the effect of the paramagnetic limiting for spin-singlet pairing. These results are applied to MnSi and ${\mathrm{C}\mathrm{e}\mathrm{P}\mathrm{t}}_3\mathrm{S}\mathrm{i}$.

• Received 15 November 2003

DOI:https://doi.org/10.1103/PhysRevLett.92.097001