Abstract
Unoccupied electronic structure of iron-based superconductors NdFeAsO0.7 (Tc=51 K), BaFe2As2 and Ba(Fe0.89Co0.11)2As2 (Tc=23 K) has been investigated by means of inverse-photoemission spectroscopy (IPES). The unoccupied Fe 3d states are observed around 1 eV above the Fermi level for all compounds. The Fe 3p-3d resonant IPES suggests that the unoccupied Fe 3d states of Ba(Fe1−xCox)2As2 have more localized character compared with those of NdFeAsO0.7. The unoccupied Nd 4f states of NdFeAsO0.7 are located around 5 and 7 eV, and the Ba 5d and Ba 4f states of Ba(Fe1−xCox)2As2 are located around 5 and 12 eV, respectively.
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