Abstract
We investigated the optical properties of FeAs-based compounds. The optical conductivity spectrum of undoped CaFe2As2 shows an abrupt opening of a gap below the magnetic/structural transition temperature (TN). The low-energy spectrum above TN is composed of two components: one is a coherent Drude term and the other is an incoherent one. Below TN, the Drude term becomes very narrow without changing its weight, and a gap seems to open in the incoherent term. The two-component feature also exists in the spectrum of superconducting Ba(Fe0.92Co0.08)2As2 and a superconducting gap opens in both components. The London penetration depth calculated from the spectral weight analysis is ≃2770Å consistent with other experiments.
Published Version
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