Options
Hubbard band versus oxygen vacancy states in the correlated electron metal SrVO3
Publikationstyp
Journal Article
Date Issued
2016-12-19
Sprache
English
Author(s)
TORE-URI
Volume
94
Issue
24
Article Number
241110
Citation
Physical Review B 24 (94): 241110 - (2016-12-19)
Publisher DOI
Scopus ID
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.
DDC Class
530: Physik
620: Ingenieurwissenschaften