Order parameter with line nodes and s±-wave symmetry for the noncentrosymmetric superconductor Li2Pt3B

Abstract

The nature and symmetry of the superconducting gap function in the noncentrosymmetric superconductor Li2Pt3B, even many years after its discovery, appear to be full of contradictions. In this article based on the existing band structure calculations we find that owing to the considerable nesting near the Fermi surface and the enhanced d character of the relevant bands that cross the Fermi level, the system gets weakly correlated. Considering the effect of the on-site Coulomb repulsion on the pairing potential perturbatively, we extract a possible superconducting transition. The strong normal spin fluctuation gives rise to a singlet-dominant gap function with accompanying sign change. Thus our theory predicts an s±-wave gap function with line nodes as the most promising candidate in the superconducting state.

Source-reported materials — not catalogue approval

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