Feb, 2006
Bulk- and surface-sensitive high-resolution photoemission study of two mott-hubbard systems: SrVO3 and CaVO3
PHYSICAL REVIEW LETTERS
- Volume
- 96
- Number
- 7
- Language
- English
- Publishing type
- Research paper (scientific journal)
- DOI
- 10.1103/PhysRevLett.96.076402
- Publisher
- AMER PHYSICAL SOC
We study the electronic structure of Mott-Hubbard systems SrVO3 and CaVO3 with bulk and surface-sensitive high-resolution photoemission spectroscopy, using a vacuum ultraviolet laser, synchrotron radiation, and a discharge lamp (h nu=7-21 eV). A systematic suppression of the density of states (DOS) within similar to 0.2 eV of the Fermi level (E-F) is found on decreasing photon energy, i.e., on increasing bulk sensitivity. The coherent band in SrVO3 and CaVO3 is shown to consist of surface and bulk-derived features, separated in energy. The stronger distortion on surface of CaVO3 compared to SrVO3 leads to a higher surface metallicity in the coherent DOS at E-F, consistent with recent theory.
- Link information
- ID information
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- DOI : 10.1103/PhysRevLett.96.076402
- ISSN : 0031-9007
- eISSN : 1079-7114
- Web of Science ID : WOS:000235554100054