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We report on terahertz time-domain spectroscopy on superconducting andmetallic iron chalcogenides Rb$_{0.75}$Fe$_{1.6}$Se$_{2-z}$S$_z$. Thesuperconducting transition is reduced from $T_c=$ 32 K ($z=0$) to 22 K($z=1.0$), and finally suppressed ($z=1.4$) by isoelectronic substitution of Sewith S. Dielectric constant and optical conductivity exhibit ametal-to-insulator transition associated with an orbital-selective Mott phase.This orbital-selective Mott transition appears at higher temperature $T_{met}$with increasing sulfur content, identifying sulfur substitution as an efficientparameter to tune orbital-dependent correlation effects in iron-chalcogenidesuperconductors. The reduced correlations of the $d_{xy}$ charge carriers canaccount for the suppression of the superconductivity and the pseudogap-likefeature between $T_c$ and $T_{met}$ that was observed for $z=0$.

Tuning orbital-selective correlation effects in superconducting Rb$_{0.75}$Fe$_{1.6}$Se$_{2-z}$S$_z$