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p + ip-wave pairing symmetry at type-II van Hove singularities

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Abstract

Based on the random phase approximation calculation in two-orbital honeycomb lattice model, we investigate the pairing symmetry of Ni-based transition-metal trichalcogenides by electron doping access to type-II van Hove singularities (vHs). We find that chiral even-parity d + id-wave (Eg) state is suppressed by odd-parity p + ip-wave (Eu) state when electron doping approaches the type-II vHs. The type-II vHs peak in density of states (DOS) enables to strengthen the ferromagnetic fluctuation, which is responsible for triplet pairing. The competition between antiferromagnetic and ferromagnetic fluctuation results in pairing phase transition from singlet to triplet pairing. The Ni-based transition-metal trichalcogenides provide a promising platform to unconventional superconductor emerging from electronic DOS.

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  1. Tin Ka-Ping College of Science, University of Shanghai for Science and Technology, Shanghai, 200093, China

    Yin-Xiang Li & Xiao-Tong Yang

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arXiv: 2103.1375. This article can also be found at http://journal.hep.com.cn/fop/EN/10.1007/s11467-021-1068-7.

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Li, YX., Yang, XT. p + ip-wave pairing symmetry at type-II van Hove singularities. Front. Phys. 16, 53501 (2021). https://doi.org/10.1007/s11467-021-1068-7

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