Abstract
We have used optical spectroscopy to probe the normal state electrodynamic response of ${\text{Fe}}_{1.06}{\text{Te}}_{0.88}{\text{S}}_{0.14}$, a member of the 11 family of iron-based superconductors with ${T}_{c}=8\text{ }\text{K}$. Measurements have been conducted over a wide frequency range $(50--50\text{ }000\text{ }{\text{cm}}^{\ensuremath{-}1})$ at selected temperatures between 10 and 300 K. At low temperatures the material behaves as an ``incoherent metal:'' a Drude-type peak is absent from the optical conductivity and all optical functions reveal that quasiparticles are not well defined down to the lowest measured temperature. We introduce ``generalized spectral weight'' analysis and use it to track temperature induced redistribution of spectral weight. Our results, combined with previous reports, indicate that the 11 family of iron-based superconductors might be different from other families.
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