Hubbard band versus oxygen vacancy states in the correlated electron metal SrVO3

S. Backes, T. C. Rödel, F. Fortuna, E. Frantzeskakis, P. Le Fèvre, F. Bertran, M. Kobayashi, R. Yukawa, T. Mitsuhashi, M. Kitamura, K. Horiba, H. Kumigashira, R. Saint-Martin, A. Fouchet, B. Berini, Y. Dumont, A. J. Kim, F. Lechermann, Harald Olaf Jeschke, M. J. RozenbergR. Valentí, A. F. Santander-Syro

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26 Citations (Scopus)

Abstract

We study the effect of oxygen vacancies on the electronic structure of the model strongly correlated metal SrVO3. By means of angle-resolved photoemission spectroscopy (ARPES) synchrotron experiments, we investigate the systematic effect of the UV dose on the measured spectra. We observe the onset of a spurious dose-dependent prominent peak at an energy range where the lower Hubbard band has been previously reported in this compound, raising questions on its previous interpretation. By a careful analysis of the dose-dependent effects we succeed in disentangling the contributions coming from the oxygen vacancy states and from the lower Hubbard band. We obtain the ARPES spectrum in the limit of a negligible concentration of vacancies, where a clear signal of a lower Hubbard band remains. We support our study by means of state-of-the-art ab initio calculations that include correlation effects and the presence of oxygen vacancies. Our results underscore the relevance of potential spurious states affecting ARPES experiments in correlated metals, which are associated with the ubiquitous oxygen vacancies as extensively reported in the context of a two-dimensional electron gas at the surface of insulating d0 transition metal oxides.

Original languageEnglish
Article number241110
JournalPhysical Review B
Volume94
Issue number24
DOIs
Publication statusPublished - Dec 19 2016
Externally publishedYes

ASJC Scopus subject areas

  • Condensed Matter Physics

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    Backes, S., Rödel, T. C., Fortuna, F., Frantzeskakis, E., Le Fèvre, P., Bertran, F., Kobayashi, M., Yukawa, R., Mitsuhashi, T., Kitamura, M., Horiba, K., Kumigashira, H., Saint-Martin, R., Fouchet, A., Berini, B., Dumont, Y., Kim, A. J., Lechermann, F., Jeschke, H. O., ... Santander-Syro, A. F. (2016). Hubbard band versus oxygen vacancy states in the correlated electron metal SrVO3. Physical Review B, 94(24), [241110]. https://doi.org/10.1103/PhysRevB.94.241110