X-ray photoemission spectroscopy of La(0.67)Ca(0.33)MnO(3) films
P. R. Broussard, S. B. Qadri, V. C. Cestone
Abstract
We have performed x-ray photoemission spectroscopy (XPS) on thin films of (001) and (200) oriented La(0.67)Ca(0.33)MnO(3) grown on (100) and (110) SrTiO(3) substrates by off-axis sputtering. The films were examined by XPS without exposing them to air. We have compared the core levels and the valence spectra between the two different orientations, as well as after the effects of air exposure and annealing in UHV. We find that the surfaces are very stable against exposure to air. Comparing the measured intensity ratios to a model for the uniform termination of the film shows the terminating layer to be MnO(2) for both the (001) and (200) oriented La(0.67)Ca(0.33)MnO(3) films.
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