Abstract
We have observed a feature at ∼2.5 eV binding energy (BE) in the valence band of La 1− x Sr x MnO 3 single crystals not previously reported in the literature. The relative intensity of this feature decreases with increasing Sr concentration x and has a strong photon energy dependence. It also exhibits a complicated angle dependence. In this report we present a full set of angular-resolved photoemission spectra performed on (1 0 0) La 1− x Sr x MnO 3 single crystals. The shape of the valence band has a strong dependence on emission and incident angles. In particular, at hν=130 eV the intensity of the 2.5 eV BE feature increases when the emission angle changes from 0 to 20°, and then sharply drops. The shape of the valence band changes with incident angle as well, and the feature is more pronounced at larger incident angles. A strong dependences on Sr doping as well as photon energy is also established.
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