Effect of a Zn impurity on T_c and its implication to pairing symmetry in LaFeAsO${}_{1-x}$F${}_x$

Abstract

The effect of non-magnetic Zn impurity on superconductivity in LaFe${}_{1-y}$Zn${}_y$AsO${}_{1-x}$F${}_x$ system is studied systematically. In the presence of Zn impurity, the superconducting transition temperature increases in the under-doped regime, remains unchanged in the optimally doped regime, and is severely suppressed in the over-doped regime. Our results suggest a switch of the symmetry of the superconducting order parameters from a $s$-wave to $s_{\pm }$ or $d$-wave states as the charge carrier doping increases in FeAs-based superconductors.

4 pages, 4 figures. Format changed and a few revisons made

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• Using controlled disorder to distinguish $s_{\pm }$ and $s_{++}$ gap structure in Fe-based superconductors
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• First-principles calculation of transition-metal impurities in LaFeAsO
• Enhancement of $T_c$ by disorder in underdoped iron pnictides
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• Linear decrease of critical temperature with increasing Zn substitution in the iron-based superconductor BaFe1.89-2xZn2xCo0.11As2
• Unexpected impact of magnetic disorder on multiband superconductivity
• The poisoning effect of Mn in LaFe(1-x)Mn(x)AsO(0.89)F(0.11): unveiling a quantum critical point in the phase diagram of iron-based superconductors
• Effect of Li-deficiency impurities on the electron-overdoped LiFeAs superconductor
• Impact of Disorder on the Superconducting Phase Diagram in BaFe${}_2$(As${}_{1-x}$P${}_x$)${}_2$
• Small-q Phonon Mediated Unconventional Superconductivity in the Iron Pnictides
• Pair breaking due to orbital magnetism in iron-based superconductors
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• Non-magnetic pair-breaking effect on La(Fe_{1-x}Zn_{x})AsO_{0.85} studied by NMR and NQR
• Small and nearly isotropic hole-like Fermi surfaces in LiFeAs detected through de Haas van Alphen-effect
• Effect of proton irradiation on the normal state low-energy excitations of Ba(Fe${}_{1-x}$Rh${}_x$)${}_2$As${}_2$ superconductors
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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
• Impurity effects on spin dynamics in magnetic and superconducting iron pnictides and chalcogenides
• Impurity effects on electronic transport in ferropnictide superconductors