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arXiv · 1107.0423

Linear decrease of critical temperature with increasing Zn substitution in the iron-based superconductor BaFe1.89-2xZn2xCo0.11As2

Jun Li·Yanfeng Guo·Shoubao Zhang·Shan Yu·Yoshihiro Tsujimoto·Hiroshi Kontani·Kazunari Yamaura·Eiji Takayama-Muromachi
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Abstract

The nonmagnetic impurity effect is studied on the Fe-based BaFe1.89Co0.11As2 superconductor (Tc = 25 K) with Zn substitution for Fe up to 8 at. %, which is achieved by means of high-pressure and high-temperature heating. Tc decreases almost linearly with increasing the Zn content and disappears at ~8 atomic %, being different in the shared phenomenology of the early Zn doping studies, where Tc decreases little. The Tc decreasing rate, however, remains much lower (3.63 K/%) than what is expected for the s(+-)-wave model, implying the model is unlikely. Another symmetry model such as the non-sign reversal s-wave model may better account for the result.

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Jun Li, Yanfeng Guo, Shoubao Zhang, Shan Yu, Yoshihiro Tsujimoto, Hiroshi Kontani, Kazunari Yamaura, Eiji Takayama-Muromachi. 2011-07-03. Linear decrease of critical temperature with increasing Zn substitution in the iron-based superconductor BaFe1.89-2xZn2xCo0.11As2. https://doi.org/10.1103/physrevb.84.020513

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