Fig. 5
Sr 3d ambient pressure X-ray photoelectron spectra and compositional fits. Sr 3d ambient pressure x-ray photoelectron spectroscopy (APXPS) background-subtracted spectra and compositional fits for a LLS, b LSL, and c SLL at p(O2) at 10−1 Torr. The orange doublet corresponds to the surface Sr component, which we attribute to the Sr-oxide, whereas the blue doublet corresponds to the lattice Sr component within the bulk film. d The change in surface Sr component concentration (p(O2) – 10−9 Torr) grows systematically with p(O2) for SLL, whereas remain constant for LSL and LLS, suggesting the reaction of the surface Sr species in SLL upon contacting atmospheric oxygen. LaMnO3-LaMnO3-LaMnO3 is referred to as “LLL”, LaMnO3-LaMnO3-SrMnO3 as “LLS”, LaMnO3-SrMnO3-LaMnO3 as “LSL”, and SrMnO3-LaMnO3-LaMnO3 as “SLL”
