Abstract
We study the electronic structure of Mott–Hubbard systems SrVO 3 and CaVO 3 with bulk and surface sensitive high-resolution photoemission spectroscopy using low-energy photons ( h ν = 7 –21 eV), including a VUV laser. A clear suppression of the density of states within ∼ 0.2 eV of the Fermi level ( E F ) is found. The coherent band in SrVO 3 and CaVO 3 is shown to consist of surface and bulk-derived features. The results indicate that the stronger distortion on the surface of CaVO 3 compared to SrVO 3 is directly reflected in the coherent DOS at E F , consistent with recent theory.
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