SnAs-based layered superconductor NaSn2As2

Abstract

Superconductivity with exotic properties has often been discovered in materials with a layered (two-dimensional) crystal structure. The low dimensionality affects the electronic structure of materials, which could realize a high transition temperature (Tc) and/or unconventional pairing mechanisms. Here, we report the superconductivity in a layered tin arsenide NaSn2As2. The crystal structure consists of (Sn2As2)2- bilayers, which is bound by van-der-Waals forces, separated by Na+ ions. Measurements of electrical resistivity and specific heat confirm the bulk nature of superconductivity of NaSn2As2 with Tc of 1.3 K. Our results propose that the SnAs layers will be a basic structure providing another universality class of a layered superconducting family, and it provides a new platform for the physics and chemistry of low-dimensional superconductors with lone pair electrons.

12 pages, 1 table, 3 figures

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• Electronic structure and superconductivity of the non-centrosymmetric Sn${}_4$As${}_3$
• Anisotropic Scattering in Goniopolar Metal NaSn${}_2$As${}_2$
• Enhanced superconductivity by Na doping in SnAs-based layered compound Na${}_{1+x}$Sn${}_{2-x}$As${}_2$
• Pressure dependence of structural, elastic, electronic, thermodynamic, and optical properties of van der Waals-type NaSn2P2 pnictide superconductor: insights from DFT study
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• Sn${}_{0.06}$Cr${}_3$Te${}_4$: A Skyrmion Superconductor
• Superconductivity in layered Zintl phase LiSn2As2