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arXiv · 1311.4660

Parity-Mixed Superconductivity in Locally Non-centrosymmetric System

Tomohiro Yoshida·Manfred Sigrist·Youichi Yanase
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Abstract

We study the parity-mixed superconductivity in locally non-centrosymmetric systems. In multilayer systems an inhomogeneous Rashba spin-orbit coupling is induced by the local violation of inversion symmetry. Our previous study revealed that a pair-density wave (PDW) phase, with a sign-modulated order parameter, is stabilized in the spin-singlet multilayer superconductors owing to the spin-orbit coupling. In this letter, we show that the uniform spin-triplet superconductivity emerges through parity mixing in the PDW phase, taking into account a weak interaction in the spin-triplet channel, which was neglected in our previous study. The spin-triplet superconducting phase is nonunitary owing to field-induced parity mixing. The critical magnetic field is markedly increased by the emergence of spin-triplet superconductivity. We calculate the density of states and analyze the signature specific to this phase.

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Tomohiro Yoshida, Manfred Sigrist, Youichi Yanase. 2013-11-19. Parity-Mixed Superconductivity in Locally Non-centrosymmetric System. https://doi.org/10.7566/jpsj.83.013703

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