title: Total-reflection inelastic X-ray scattering from a 10-nm thick La0.6Sr0.4CoO3 thin film.
abstract: To study equilibrium changes in composition, valence, and electronic structure near the surface and into the bulk, we demonstrate the use of a new approach, total-reflection inelastic x-ray scattering, as a sub-keV spectroscopy capable of depth profiling chemical changes in thin films with nanometer resolution. By comparing data acquired under total x-ray reflection and penetrating conditions, we are able to separate the O K-edge spectra from a 10 nm La0.6Sr0.4CoO3 thin film from that of the underlying SrTiO3 substrate. With a smaller wavelength probe than comparable soft x-ray absorption measurements, we also describe the ability to easily access dipole-forbidden final states, using the dramatic evolution of the La N4,5 edge with momentum transfer as an example.
authors.affiliation: Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA. fister@anl.gov
authors.forename: T T
authors.initials: TT
authors.lastname: Fister
authors.forename: D D
authors.initials: DD
authors.lastname: Fong
authors.forename: J A
authors.initials: JA
authors.lastname: Eastman
authors.forename: H
authors.initials: H
authors.lastname: Iddir
authors.forename: P
authors.initials: P
authors.lastname: Zapol
authors.forename: P H
authors.initials: PH
authors.lastname: Fuoss
authors.forename: M
authors.initials: M
authors.lastname: Balasubramanian
authors.forename: R A
authors.initials: RA
authors.lastname: Gordon
authors.forename: K R
authors.initials: KR
authors.lastname: Balasubramaniam
authors.forename: P A
authors.initials: PA
authors.lastname: Salvador
mesh_terms: D003035:Cobalt / Q000737:chemistry*; D004548:Elasticity; D007811:Lanthanum / Q000737:chemistry*; D010087:Oxides / Q000737:chemistry*; D013324:Strontium / Q000737:chemistry*; D014025:Titanium / Q000737:chemistry; D014961:X-Ray Diffraction
chemical_list: D010087:Oxides; D003035:Cobalt; D007811:Lanthanum; D014025:Titanium; C119252:strontium titanium oxide; D013324:Strontium