Superconductivty without inversion symmetry: MnSi versus CePt_3Si

TL;DR

This paper investigates how the absence of inversion symmetry in materials like MnSi and CePt_3Si affects superconductivity, revealing that spin-triplet pairing can occur and that paramagnetic limiting behaves differently than previously thought.

Contribution

It demonstrates that spin-triplet pairing is possible without inversion symmetry and analyzes paramagnetic limiting effects in such systems, applying findings to MnSi and CePt_3Si.

Findings

Spin-triplet pairing is not entirely excluded without inversion symmetry.

Lack of inversion symmetry reduces paramagnetic limiting for spin-singlet pairing.

Results are specifically applied to MnSi and CePt_3Si.

Abstract

Superconductivity in materials without spatial inversion symmetry is studied. We show that in contrast to common believe, 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 CePt_3Si.