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Photoemission Study of the Electronic Structure of LaFeAsO1-xFx and LaFePO1-xFx

We have performed a photoemission spectroscopy study of the newly discovered iron-based superconductors LaFeAsO 1- x F x and LaFePO 1- x F x . The valence-band spectra show a narrow Fe 3 d -derived band near E F indicating the itinerant character of the Fe 3 d states. In going from the undoped to F-doped compounds, all the spectra are found to shift to higher binding energies, consistent with electron doping within the rigid-band model. Also, in going from LaFeAsO 1- x F x to LaFePO 1- x F x , the near- E F intensity increases reflecting the weakening of electron correlation.