The electronic structure of La{sub 0.66}Ca{sub 0.33}MnO{sub 3} and La{sub 1.2}Sr{sub 1.8}Mn{sub 2}O{sub 7} studied by angle resolved photoemission

We report angle resolved photoemission studies of La{sub 0.66}Ca{sub 0.33}MnO{sub 3} and La{sub 1.2}Sr{sub 1.8}Mn{sub 2}O{sub 7} using single crystal samples. The Mn 3p-3d resonance photoemission data of La{sub 0.66}Ca{sub 0.33}MnO{sub 3} show that the states at 2.5 eV binding energy have predominantly Mn 3d character, qualitatively consistent with the predictions of local spin density approximation calculations except for a 1 eV shift toward higher binding energy. Band dispersions are observed in the normal emission data. The spectra of La{sub 1.2}Sr{sub 1.8}Mn{sub 2}O{sub 7} show well defined features and strong matrix element effects, indicating excellent surface quality. (c) 2000 American Institute of Physics.