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Bulk and surface-sensitive high-resolution photoemission study of Mott-Hubbard systems SrVO$_3$ and CaVO$_3$

R. Eguchi·T. Kiss·S. Tsuda·T. Shimojima·T. Mizokami·T. Yokoya·A. Chainani·S. Shin·I. H. Inoue·T. Togashi·S. Watanabe·C. Q. Zhang·C. T. Chen·M. Arita·K. Shimada·H. Namatame·M. Taniguchi
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Abstract

We study the electronic structure of Mott-Hubbard systems SrVO$_{3}$ and CaVO$_3$ with bulk and surface-sensitive high-resolution photoemission spectroscopy (PES), using a VUV laser, synchrotron radiation and a discharge lamp ($hν$ = 7 - 21 eV). A systematic suppression of the density of states (DOS) within $\sim$ 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 SrVO$_{3}$ and CaVO$_3$ is shown to consist of surface and bulk derived features, separated in energy. The stronger distortion on surface of CaVO$_{3}$ compared to SrVO$_{3}$ leads to higher surface metallicity in the coherent DOS at $E_F$, consistent with recent theory.

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R. Eguchi, T. Kiss, S. Tsuda, T. Shimojima, T. Mizokami, T. Yokoya, A. Chainani, S. Shin, I. H. Inoue, T. Togashi, S. Watanabe, C. Q. Zhang, C. T. Chen, M. Arita, K. Shimada, H. Namatame, M. Taniguchi. 2005-11-29. Bulk and surface-sensitive high-resolution photoemission study of Mott-Hubbard systems SrVO$_3$ and CaVO$_3$. https://doi.org/10.1103/physrevlett.96.076402

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