Superconductivity in layered Zintl phase LiSn2As2

Junjie Wang; Xiangru Cui; Yimin Wan; Tianping Ying; Shiyan Li; Jiangang Guo

Superconductivity in layered Zintl phase LiSn2As2

Superconductivity 2021-11-23 v1 Materials Science

Authors: Junjie Wang , Xiangru Cui , Yimin Wan , Tianping Ying , Shiyan Li , Jiangang Guo

Abstract

We report the superconductivity in the layered Zintl phase LiSn $_2$ As $_2$ , which is isostructural to NaSn $_2$ As $_2$ and has a transition temperature ( $T_{\mathrm{c}}$ ) of 1.6 K. Despite similar $T_{\mathrm{c}}$ and Debye temperatures, substituting of Na with Li considerably increases the upper critical field. Based on a systematically comparation of Sn $_4$ As $_3$ , NaSnAs, NaSn $_2$ As $_2$ ,Na $_{1-x}$ Sn $_2$ P $_2$ , SrSn $_2$ As $_2$ , and LiSn $_2$ As $_2$ , we propose that carrier doping, intimately related to the formation of lone-pair electrons, controls superconductivity in layered SnAs-based compounds rather than chemical pressure. The current findings provide a thorough and comprehensive understanding of Sn-based Zintl phase.

Keywords

superconductivity high-temperature superconductivity single crystal superconductivity

Cite

@article{arxiv.2111.11319,
  title  = {Superconductivity in layered Zintl phase LiSn2As2},
  author = {Junjie Wang and Xiangru Cui and Yimin Wan and Tianping Ying and Shiyan Li and Jiangang Guo},
  journal= {arXiv preprint arXiv:2111.11319},
  year   = {2021}
}

Comments

7 pages; 5 figures

Superconductivity in layered Zintl phase LiSn2As2

Abstract

Keywords

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