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Connections between crystal chemistry and critical temperature $T_c$ havebeen in the focus of superconductivity, one of the most widely studiedphenomena in physics, chemistry and materials science alike. In most Fe-basedsuperconductors, materials chemistry and physics conspire so that $T_c$correlates with the average anion height above the Fe plane, i. e. with thegeometry of the FeAs4 or FeCh4 (Ch = Te, Se, or S) tetrahedron. By synthesizingFe$_{1-y}$Se$_{1-x}$S$_x$ (0$\leq$$x$$\leq$1, $y$$\leq$0.1), we find that inalloyed crystals $T_c$ is not correlated with the anion height like it is formost other Fe superconductors. Instead, changes in $T_c$($x$) andtetragonal-to-orthorombic (nematic) transition $T_s$($x$) upon cooling arecorrelated with disorder in Fe vibrations in the direction orthogonal to Feplanes, along the crystallographic c-axis. The disorder stems from the randomnature of S substitution, causing deformed Fe(Se,S)4 tetrahedra with differentFe-Se and Fe-S bond distances. Our results provide evidence of $T_c$ and $T_s$suppression by disorder in anion height. The connection to local crystalchemistry may be exploited in computational prediction of new superconductingmaterials with Fe/S building blocks.

Suppression of Superconductivity and Nematic Order in Fe$_{1-y}$Se$_{1-x}$S$_x$ (0$\leq$$x$$\leq$1, $y$$\leq$0.1) Crystals by Anion Height Disorder