Effect of Co Impurities on Superconductivity of FeSe0.4Te0.6 single crystals

Abstract

The effect of Co doping on supercoductivity of FeSe${}_{0.4}$Te${}_{0.6}$ single crystals is investigated. The superconducting transition temperature decreases linearly for Co doping with the rate -0.75 K/(Co %). On the other hand, the residual resistivity increase is less than 50 $/mu/Omega$cm for 4 % Co doping. These data are consistent with the sign changing interband scattering mechanism of superconductivity ($s_{/}pm$ symmetry).

10 pages, 6 figures

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• Influence of substitutional disorder on the electrical transport and the superconducting properties of Fe${}_{1+z}$Te${}_{1-x-y}$Se${}_x$S${}_y$