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We present the c-axis optical reflectance measurement on single crystals ofBaFe$_2$As$_2$ and SrFe$_2$As$_2$, the parent compounds of FeAs basedsuperconductors. Different from the ab-plane optical response where twodistinct energy gaps were observed in the SDW state, only the smaller energygap could be seen clearly for \textbf{E}$\parallel$c-axis. The very pronouncedenergy gap structure seen at a higher energy scale for\textbf{E}$\parallel$ab-plane is almost invisible. We propose a novel picturefor the band structure evolution across the SDW transition and suggestdifferent driving mechanisms for the formation of the two energy gaps.

physical review letters

Measurement of the c-axis optical reflectance of AFe$_2$As$_2$ (A=Ba,  Sr) single crystals: Evidence of different mechanisms for the formation of  two energy gaps