Abstract
We have investigated the electronic structure of an electron-doped double perovskite series Sr 2− x La x FeMoO 6 by photoemission spectroscopy and LDA + U band-structure calculations. Characteristic double-peak structures observed at ∼0.2 eV (Feature A) and ∼1.3 eV (Feature B) have been identified to be a Fe–Mo t 2g↓ band and a Fe e g↑ band, respectively. Upon La substitution, Feature A moves away from the Fermi level by ∼50 meV, reflecting electron-doping. At the same time, the intensity enhancement of both A and B has been observed, which can be understood in terms of the strong Hund's rule energy stabilization in 3d 5 configuration.
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