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How does the substitution of Fe affect the superconducting properties of the material? 


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The substitution of Fe in different materials has varying effects on their superconducting properties. In the case of Fe1−xMnxSe0.5Te0.5, the substitution of Mn significantly improves the bulk superconducting properties, increasing the superconducting transition temperatures . On the other hand, in the Mo-based solid solution alloys (MoRux)3Sb7 and (MoFex)3Sb7, Fe substitution leads to a depression of both the superconducting parameters and the spin-gap, while Ru substitution enhances the superconducting parameters and benefits the spin-gap opening . In FeSe1−xSx, S doping enhances the superconducting transition temperature and tunes the charge carriers, but the nematic order has no universal influence on the superconductivity . Additionally, in FeSe thin films, the substitution of Te for Se can extinguish the structural transition and increase the superconducting transition temperature .

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The substitution of Fe with Mn in FeSe0.5Te0.5 single crystals improves the bulk superconducting properties, increasing the superconducting transition temperatures and enhancing the critical current density.
In the Fe-substituted samples, there is a depression of both Tc (superconducting transition temperature) and Hc2 (upper critical field), accompanied by vanishing spin-gap and low-dimensional magnetic correlation.
The provided paper does not mention the substitution of Fe. The paper is about the effect of S doping on the superconductivity and nematicity transition of FeSe.
The provided paper does not mention the substitution of Fe and its effect on the superconducting properties of the material.

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