Inherent charge transfer layer formation at La0.6Sr0.4FeO3/La0.6Sr0.4MnO3 heterointerface

We have investigated the Mn 3d spectral function in La0.6Sr0.4FeO3(LSFO)/La0.6Sr0.4MnO3(LSMO) heterointerfaces as well as of La1-x SrxMnO3 films using Mn 2p-3d resonant photoemission spectroscopy. The strong enhancement of the Mn 3d spectra at the Mn 2p-3d threshold enables us to extract the Mn 3d spectra of LSMO layers in the vicinity of the interface with the LSFO overlayers. We have found that the spectral intensity of e(gup arrow) states near the Fermi level is gradually reduced with increasing LSFO overlayer thickness and is finally saturated at 5-7 ML. The close similarity in reduction of the intensity of the e(gup arrow) states between the LSFO/LSMO interface and hole-doped LSMO films indicates the occurrence of charge transfer at the interface between the LSMO and LSFO layers. (C) 2004 American Institute of Physics.