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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 ISSN 1098-0121.
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Official URL: http://dx.doi.org/10.1103/PhysRevB.91.165123
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 | ||||||
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| Subjects: | Q Science > QC Physics Q Science > QE Geology |
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| Divisions: | Faculty of Science, Engineering and Medicine > 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: |
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| 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 | ||||||
| Date of first compliant deposit: | 24 April 2017 | ||||||
| Date of first compliant Open Access: | 24 April 2017 | ||||||
| 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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