2015/04/20 by J. Laverock, J. Kuyyalil, Jithesh Kuyyalil +10 · 12 citations
Engineering · Materials Science · Physics and Astronomy · #Electron #Electronic and Structural Properties of Oxides #Magnetic and transport properties of perovskites and related materials #Nuclear physics #Physics #Semiconductor materials and devices #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.91.165123
published in Physical Review B 91(16) (American Physical Society)
arxiv created 2015/04/20 · openalex publication_date 2015/04/20 · arxiv updated 2015/04/22 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We report hard x-ray photoemission spectroscopy measurements of the electronic structure of the prototypical correlated oxide SrxCa_1\ensuremath-xVO3. By comparing spectra recorded at different excitation energies, we show that 2.2 keV photoelectrons contain a substantial surface component, whereas 4.2 keV photoelectrons originate essentially from the bulk of the sample. Bulk-sensitive measurements of the O 2p valence band are found to be in good agreement with ab initio calculations of the electronic structure, with some modest adjustments to the orbital-dependent photoionization cross sections. The evolution of the O 2p electronic structure as a function of the Sr content is dominated by A-site hybridization. Near the Fermi level, the correlated V 3d Hubbard bands are found to evolve in both binding energy and spectral weight as a function of distance from the vacuum interface, revealing higher correlation at the surface than in the bulk.