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Using angle-integrated photoemission spectroscopy we have probed the novelLaO$_{0.9}$F$_{0.1}$FeAs superconductor over a wide range of photon energiesand temperatures. We have provided the first full characterization of theorbital character of the VB DOS and of the magnitude of the d-p hybridizationenergy. Finally, we have identified two characteristic temperatures: 90K wherea pseudogap-like feature appears to close and 120K where a sudden change in theDOS near E$_F$ occurs. We associate these phenomena with the SDW magneticordering and the structural transition seen in the parent compound,respectively. These results suggest the important role of electron correlation,spin physics and structural distortion in the physics of Fe-basedsuperconductors.

Core Level and Valence Band Study of LaO$_{0.9}$F$_{0.1}$FeAs