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We report on infrared studies of charge dynamics in a prototypical pnictidesystem: the BaFe2As2 family. Our experiments have identified hallmarks of thepseudogap state in the BaFe2As2 system that mirror the spectroscopicmanifestations of the pseudogap in the cuprates. The magnitude of the infraredpseudogap is in accord with that of the spin-density-wave gap of the parentcompound. By monitoring the superconducting gap of both P- and Co-dopedcompounds, we find that the infrared pseudogap is unrelated tosuperconductivity. The appearance of the pseudogap is found to correlate withthe evolution of the antiferromagnetic fluctuations associated with thespin-density-wave instability. The strong-coupling analysis of infrared datafurther reveals the interdependence between the magnetism and the pseudogap inthe iron pnictides.

Infrared Measurement of the Pseudogap in P-Doped and Co-Doped BaFe2As2 High-Temperature Superconductors