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We have carried out an investigation of the structural, magnetic, transportand superconducting properties of Fe$_{1+z}$Te$_{1-x-y}$Se$_x$S$_y$ ceramiccompounds, for $z=0$ and some specific Se (0$\leq$ x $\leq$ 0.5) and S (0$\leq$ y $\leq$0.12) contents. The incorporation of Se and S to the FeTestructure produces a progressive reduction of the crystallographic parametersas well as different degrees of structural disorder associated with thedifferences of the ionic radius of the substituting cations. In the presentstudy, we measure transport properties of this family of compounds and we showthe direct influence of disorder in the normal and superconductor states. Wenotice that the structural disorder correlates with a variable range hoppingconducting regime observed at temperatures $T >$ 200 K. At lower temperatures,all the samples except the one with the highest degree of disorder show acrossover to a metallic-like regime, probably related to the transport ofresilient-quasi-particles associated with the proximity of a Fermi liquid stateat temperatures below the superconducting transition. Moreover, thesuperconducting properties are depressed only for that particular sample, inaccordance to the condition that superconductivity is affected by disorder whenthe electronic localization length $\xi_L$ becomes smaller than the coherencelength $\xi_{SC}$.

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