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We performed optical spectroscopy measurement on single crystals ofBaFe$_2$As$_2$ and SrFe$_2$As$_2$, the parent compounds of FeAs basedsuperconductors. Both are found to be quite metallic with fairly large plasmafrequencies at high temperature. Upon entering the spin-density-wave (SDW)state, formation of partial energy gaps was clearly observed with the presenceof surprisingly two different energy scales. A large part of the Drudecomponent was removed by the gapping of Fermi surfaces (FS). Meanwhile, thecarrier scattering rate was even more dramatically reduced. We elaborate thatthe SDW instability is more likely to be driven by the FS nesting of itinerantelectrons rather than a local-exchange mechanism.

Origin of the spin density wave instability in AFe$_2$As$_2$ (A=Ba, Sr) as revealed by optical spectroscopy