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The temperature-dependence of the in-plane optical properties of(CaFe$_{1-x}$Pt$_{x}$As)$_{10}$Pt$_{3}$As$_{8}$ have been investigated for theundoped ($x=$0) parent compound, and the optimally-doped ($x=$0.1)superconducting material ($T_{c}\simeq$ 12 K) over a wide frequency range. Theoptical conductivity has been described using two free-carrier (Drude)components, in combination with oscillators to describe interband transitions.At room temperature, the parent compound may be described by a strong, broadDrude term, as well as a narrow, weaker Drude component. Below the structuraland magnetic transitions at $\simeq$ 96 and 83 K, respectively, strength istransferred from the free-carrier components into a bound excitation at$\simeq$ 1000 cm$^{-1}$, and the material exhibits semiconducting-likebehavior. In the optimally-doped sample, at room temperature the opticalproperties are again described by narrow and broad Drude responses comparableto the parent compound; however, below $T^\ast \simeq$ 100 K, strength from thenarrow Drude is transferred into a newly-emergent low-energy peak at $\simeq$120 cm$^{-1}$, which arises from a localization process, resulting insemiconducting-like behavior. Interestingly, below $T_{c}$, this peak alsocontributes to the superfluid weight, indicating that some localized electronscondense into Cooper pairs; this observation may provide insight into thepairing mechanism in iron-based superconductors.

physical review. b./physical review. b

Unravelling the mechanism of the semiconducting-like behavior and its  relation to superconductivity in  (CaFe$_{1-x}$Pt$_{x}$As)$_{10}$Pt$_{3}$As$_{8}$