Daisuke Maruyama, Youichi Yanase
Non-centrosymmetric superconductors, Li2Pd3B and Li2Pt3B show different superconducting properties despite the same crystal symmetry. We investigate the spin susceptibility of non-centrosymmetric superconductors accompanied by the topological transition of Fermi surfaces due to anti-symmetric spin-orbit coupling, which are indicated by the first principle band structure calculation for Li2Pt3B. We study three topological transitions, namely (A) the disappearance of Fermi surface, (B) crossing the Dirac point, and (C) crossing the saddle point van-Hove singularity. The spin susceptibility in the superconducting state is enhanced by the topological transitions (A) and (C), while that is decreased by (B). We discuss the unusual magnetic properties observed in Li2Pt3B on the basis of these results.
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http://arxiv.org/abs/1301.0976
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