Suppression of $T_c$ by Zn impurity in the electron-type LaFe$_{0.925-y}$Co$_{0.075}$Zn$_y$AsO system

Yuke Li; Jun Tong; Qian Tao; Guanghan Cao; Zhuan Xu

doi:10.1016/j.jpcs.2010.10.071

paper

Suppression of $T_{c}$ by Zn impurity in the electron-type LaFe $_{0.925 - y}$ Co $_{0.075}$ Zn $_{y}$ AsO system

arXiv:1011.6008 · doi:10.1016/j.jpcs.2010.10.071

Abstract

The effect of non-magnetic Zn impurity on superconductivity in electron-type pnictide superconductor LaFe $_{0.925 - y}$ Co $_{0.075}$ Zn $_{y}$ AsO is studied systematically. The optimally doped LaFe $_{0.925}$ Co $_{0.075}$ AsO without Zn impurity exhibits superconductivity at $T_{c}^{mi d}$ of 13.2 K, where $T_{c}^{mi d}$ is defiend as the mid-point in the resistive transition. In the presence of Zn impurity, the superconducting transition temperature, $T_{c}^{mi d}$ , is severely suppressed. The result is consistent with the theoretic prediction on the effect of non-magnetic impurity in the scenario of $s_{\pm}$ pairing, but it is in sharp contrast to the previous report on the effect of Zn impurity in the F-doped systems. The possible interpretation of the different effects of Zn impurity on superconductivity in different systems is discussed.

4 pages, 5 figures, to appear in Proceedings of SNS 2010, Journal of Physics and Chemistry of Solids (in press)

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Non-magnetic pair-breaking effect on La(Fe_{1-x}Zn_{x})AsO_{0.85} studied by NMR and NQR

Suppression of Tc​ by Zn impurity in the electron-type LaFe0.925−y​Co0.075​Zny​AsO system

Abstract

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Suppression of $T_{c}$ by Zn impurity in the electron-type LaFe $_{0.925 - y}$ Co $_{0.075}$ Zn $_{y}$ AsO system