Determination of conduction and valence band electronic structure of La2Ti2O7 thin film

(a) RIXS map of La2Ti2O7; (b) extracted spectra of HR-XAS (red) and valence-to-core XES (blue); (c) FEFF calculated orbital contribution.
(a) RIXS map of La2Ti2O7; (b) extracted spectra of HR-XAS (red) and valence-to-core XES (blue); (c) FEFF calculated orbital contribution.
Abstract:
The electronic structure of a La2Ti2O7-layered perovskite thin film was determined by resonant inelastic X-ray scattering (RIXS) measurements and FEFF calculations. It was found that the empty Ti and La d-band states dominate the conduction band of the structure, whereas the top edge of the valence band is mainly composed of filled O-p states. Furthermore, there is a pronounced overlap between occupied La-p states and O-s states, which are located deeper in the valence band.
Keywords: La2Ti2O7; Electronic structure; RIXE; FEFF;

Facility: ENE, SLS, LMX, Thin Films and Interfaces

Reference: Jakub Szlachetko, Markus Pichler, Daniele Pergolesi, Jacinto Sá and Thomas Lippert, RSC Adv., 4, 11420-11422 (2014)

Read full article: here