Enhanced electron correlations at the SrxCa1-xVO3 surface

J. Laverock, J. Kuyyalil, B. Chen, R. P. Singh, B. Karlin, J. C. Woicik, G. Balakrishnan, K. E. Smith

Research output: Contribution to journalArticle (Academic Journal)peer-review

7 Citations (Scopus)

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.

Original languageEnglish
Article number165123
JournalPhysical Review B: Condensed Matter and Materials Physics
Volume91
Issue number16
DOIs
Publication statusPublished - 20 Apr 2015

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