Orbital-limiting and modulation induced by missing parity in non-centrosymmetric superconductors

Details Orbital-limiting and modulation induced by missing parity in non-centrosymmetric superconductors Orbital-limiting and modulation induced by missing parity in non-centrosymmetric superconductors

2008-10-10

arxiv.org/abs/0810.1820v2

Physics

Condensed Matter

Superconductivity

4 figures, To appear in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.78.224514

We examine the depairing field $H_{c2}(T)$ of non-centrosymmetric superconductors with a spin-orbit coupling larger than the Zeeman energy at $H_{c2}(0)$ by taking account of the mixing of spin-singlet and triplet pairing states due to the missing parity. When the singlet and triplet pairing components are mixed with an equal weight in a cubic non-centrosymmetric system, the paramagnetic depairing effect is significantly suppressed so that $H_{c2}(T)$ approaches its orbital-limited value. A similar event also occurs in a quasi two-dimensional Rashba non-centrosymmetric system. The present results are relevant to the $H$-$T$ phase diagrams of CePt$_3$Si and the families of Li$_2$Pd$_{3-x}$Pt$_x$B.

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