Enhanced electron correlations at the SrxCa1-xVO3 surface

Abstract

We report hard x-ray photoemission spectroscopy measurements of the electronic structure of the prototypical correlated oxide SrxCa1-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.

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Cited by in corpus (5)

• Correlated electronic states of SrVO3 revealed by angle-resolved photoemission spectroscopy
• Metal-insulator transition in CaVO${}_3$ thin films: interplay between epitaxial strain, dimensional confinement, and surface effects
• Quantum Confinement Induced Metal-Insulator Transition in Strongly Correlated Quantum Wells of SrVO${}_3$ Superlattice
• Nano-engineering of electron correlation in oxide superlattices
• One-step approach to ARPES from strongly correlated solids: a Mott-Hubbard system