Triplet Cooper Pair Formation by Anomalous Spin Fluctuations in Non-centrosymmetric Superconductors

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  • Takimoto Tetsuya
    Max Planck Institute for Chemical Physics of Solids Asia Pacific Center for Theoretical Physics, Pohang University of Science and Technology
  • Thalmeier Peter
    Max Planck Institute for Chemical Physics of Solids

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A microscopic theory for the spin triplet Cooper pairing in non-centrosymmetric superconductors like CePt3Si and CeTSi3 (T = Rh, Ir) is presented. The lack of inversion symmetry leads to new anomalous spin fluctuations which stabilize the triplet part in addition to the singlet part originating from the centrosymmetric spin fluctuations. It is shown that both parts have similar nontrivial momentum dependence of A1 type. Therefore the mixed singlet-triplet gap function has accidental line nodes on both Fermi surface sheets which are stable as function of temperature. This gap function explains the salient features of CePt3Si and CeTSi3 superconductors.

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