Bulk- and Surface-Sensitive High-Resolution Photoemission Study of Two Mott-Hubbard Systems : SrVO3 and CaVO3
PhysRevLett_96_076402.pdf 351 KB
Inoue, Isao H.
Zhang, C. Q.
Chen, C. T.
electronic density of states
strongly correlated electron systems
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 (hν=7–21 eV). A systematic suppression of the density of states (DOS) within ~0.2 eV of the Fermi level (EF) 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 EF, consistent with recent theory.
Physical Review Letters
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American Physical Society
Copyright (c) 2006 The American Physical Society.
Graduate School of Science
Hiroshima Synchrotron Radiation Center