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Nonunitary triplet pairing in the noncentrosymmetric superconductor LaNiC2

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Original languageEnglish
Article number217
Number of pages7
JournalEuropean Physical Journal B: Condensed Matter
Volume91
DOIs
DateSubmitted - 26 Feb 2018
DatePublished (current) - 1 Oct 2018

Abstract

We present a first-principles based semiphenomenological approach to study the superconductivity in the noncentrosymmetric superconductor LaNiC2 with spin-orbit coupling. Based on group theoretical considerations, it was already shown that the breaking of time-reversal symmetry is only compatible with nonunitary triplet pairing states. To investigate the pairing mechanism by which this comes about and the possible role of the lack of inversion symmetry, we have combined the relativistic spin-polarized version of Korringa-Kohn-Rostoker method for the solution of the Dirac-Bogoliubov-de Gennes equations with a semiphenomenological parametrization of the pairing interaction. This made possible to study different orbital specific pairing models in quantitative details. We compare our predictions for the temperature dependence of the specific heat and it is found that it can be described by an interorbital equal-spin pairing on the nickel which breaks the time-reversal symmetry.

    Research areas

  • Unconventional superconductors, physics, electronic properties

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    Rights statement: This is the final published version of the article (version of record). It first appeared online via Springer Link at https://doi.org/10.1140/epjb/e2018-90095-7 . Please refer to any applicable terms of use of the publisher.

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    Licence: CC BY

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