Electronic structure of doped LaMnO3 perovskite studied by x-ray photoemission spectroscopy

The electronic structure of La2/3Sr1/6Pb1/6MnO3 has been studied by x-ray p hotoemission spectroscopy (XPS). The valence band spectrum is compared with ab initio electronic structure calculations using a linearized muffin-tin orbital (LMTO) method. The XPS measurements and the theoretical band struct ure calculations for La1/2Sr1/4Pb1/4MnO3 show that the electronic structure consists mainly of Mn(3d) and O(2p) states. In addition, the Mn(3d) and O( 2p) states are hybridized over the whole valence band. States of 3d charact er localized on Mn sites predominate near the top of the valence band. It w as found that the doping, both with the Pb and the Sr ions, increases the s pin polarization by up to 48%.