Abstract:We report the superconductivity in the layered Zintl phase LiSn2As2, which is isostructural to NaSn2As2 and has a transition temperature (Tc) of 1.6 K. Despite similar Tc and Debye temperatures, substituting of Na with Li considerably increases the upper critical field. Based on a systematically comparation of Sn4As3, NaSnAs, NaSn2As2,Na1−xSn2P2, SrSn2As2, and LiSn2As2, we propose that carrier doping, intimately related to the formation of lone-pair electrons, controls superconductivity in layered SnAs-based c… Show more
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