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Enhanced electron correlations at the SrxCa1−xVO3 surface

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Laverock, J., Kuyyalil, J., Chen, B., Singh, R. P., Karlin, B., Woicik, J. C., Balakrishnan, Geetha and Smith, K. E. (2015) Enhanced electron correlations at the SrxCa1−xVO3 surface. Physical Review B, 91 (16). 165123 . doi:10.1103/PhysRevB.91.165123

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Official URL: http://dx.doi.org/10.1103/PhysRevB.91.165123

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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.

Item Type: Journal Article
Subjects: Q Science > QC Physics
Q Science > QE Geology
Divisions: Faculty of Science > Physics
Library of Congress Subject Headings (LCSH): Perovskite, Condensed matter, Surfaces (Physics), Electronic structure
Journal or Publication Title: Physical Review B
Publisher: American Physical Society
ISSN: 1098-0121
Official Date: 20 April 2015
Dates:
DateEvent
20 April 2015Published
8 April 2015Accepted
Volume: 91
Number: 16
Article Number: 165123
DOI: 10.1103/PhysRevB.91.165123
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
Copyright Holders: American Physical Society
Funder: United States. Department of Energy, Boston University, University of Warwick, Engineering and Physical Sciences Research Council (EPSRC)
Grant number: DE-FG02-98ER45680, DE-AC02-98CH10886 (Department of Energy), EP/I007210/1 (ESRC)

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