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The nature and symmetry of the superconducting gap function in thenoncentrosymmetric superconductor (NCS) Li2Pt3B, even many years after itsdiscovery, appears to be full of contradictions. In this letter based on theexisting band structure calculations we find that owing to the considerablenesting near the Fermi surface and the enhanced d-character of the relevantbands that cross the Fermi level,the system gets somewhat strongly correlated.Considering the effect of the onsite Coulomb repulsion on the pairing potentialperturbatively, we extract possible superconducting transition. The strongnormal spin fluctuation gives rise to a singlet dominant gap function withaccompanying sign change. Thus our theory predicts a $s_\pm$ wave gap functionwith line nodes as the most promising candidate in the superconducting state.

Nature and symmetry of the order parameter of the noncentrosymmetric superconductor Li2Pt3B