Enhanced superconductivity by Na doping in SnAs-based layered compound Na$_{1+x}$Sn$_{2-x}$As$_2$

Hao Yuwen; Yosuke Goto; Rajveer Jha; Akira Miura; Chikako Moriyoshi; Yoshihiro Kuroiwa; Tatsuma D. Matsuda; Yuji Aoki; Yoshikazu Mizuguchi

doi:10.7567/1347-4065/ab2eb1

Enhanced superconductivity by Na doping in SnAs-based layered compound Na$_{1+x}$Sn$_{2-x}$As$_2$

Superconductivity 2019-07-23 v1 Materials Science

Authors: Hao Yuwen , Yosuke Goto , Rajveer Jha , Akira Miura , Chikako Moriyoshi , Yoshihiro Kuroiwa , Tatsuma D. Matsuda , Yuji Aoki , Yoshikazu Mizuguchi

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Abstract

Superconducting transition temperature (Tc) reported in SnAs-based layered compound NaSn $_2$ As $_2$ varies from 1.2 to 1.6 K, implying that its superconductivity is critically sensitive to non-stoichiometry. Here, we demonstrate that Na-doping on the Sn site (Na $_{1+x}$ Sn $_{2-x}$ As $_2$ ) is effective in enhancing superconductivity, leading to Tc = 2.1 K for x = 0.4. First-principles calculation indicates that such a doping, or Na $_{\rm Sn}$ antisite defects, is energetically favored over other cation vacancies. Our results pave the way for increasing Tc of layered tin pnictide superconductors.

Keywords

superconductivity Na doping SnAs-based compounds layered pnictides antisite defects first-principles calculation Tc enhancement

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@article{arxiv.1907.09287,
  title  = {Enhanced superconductivity by Na doping in SnAs-based layered compound Na$_{1+x}$Sn$_{2-x}$As$_2$},
  author = {Hao Yuwen and Yosuke Goto and Rajveer Jha and Akira Miura and Chikako Moriyoshi and Yoshihiro Kuroiwa and Tatsuma D. Matsuda and Yuji Aoki and Yoshikazu Mizuguchi},
  journal= {arXiv preprint arXiv:1907.09287},
  year   = {2019}
}

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21 pages, 9 figures, 1 Table

Enhanced superconductivity by Na doping in SnAs-based layered compound Na$_{1+x}$Sn$_{2-x}$As$_2$

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