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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, H. O. Jeschke, M. J. Rozenberg, R. Valentí, and A. F. Santander-Syro
Phys. Rev. B 94, 241110(R) – Published 19 December 2016
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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.

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  • Received 22 February 2016

DOI:https://doi.org/10.1103/PhysRevB.94.241110

©2016 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

S. Backes1, T. C. Rödel2,3, F. Fortuna2, E. Frantzeskakis2, P. Le Fèvre3, F. Bertran3, M. Kobayashi4, R. Yukawa4, T. Mitsuhashi4, M. Kitamura4, K. Horiba4, H. Kumigashira4, R. Saint-Martin5, A. Fouchet6, B. Berini6, Y. Dumont6, A. J. Kim1, F. Lechermann7,8, H. O. Jeschke1, M. J. Rozenberg9, R. Valentí1,*, and A. F. Santander-Syro2,†

  • 1Institut für Theoretische Physik, Goethe-Universität Frankfurt, Max-von-Laue-Strasse 1, 60438 Frankfurt am Main, Germany
  • 2CSNSM, Univ. Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, 91405 Orsay Cedex, France
  • 3Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin-BP48, 91192 Gif-sur-Yvette, France
  • 4Photon Factory, Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), 1-1 Oho, Tsukuba 305-0801, Japan
  • 5SP2M-ICMMO - UMR-CNRS 8182 Université Paris-Sud, Université Paris-Saclay, 91405 Orsay Cedex, France
  • 6GEMaC, Université de Versailles St. Quentin en Y. - CNRS, Université Paris-Saclay, Versailles, France
  • 7Institut für Theoretische Physik, Universität Hamburg, Jungiusstrasse 9, 20355 Hamburg, Germany
  • 8Institut für Keramische Hochleistungswerkstoffe, TU Hamburg-Harburg, D-21073 Hamburg, Germany
  • 9Laboratoire de Physique des Solides, CNRS, Univ. Paris-Sud, Université Paris-Saclay, 91405 Orsay Cedex, France

  • *valenti@itp.uni-frankfurt.de
  • andres.santander@csnsm.in2p3.fr

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Issue

Vol. 94, Iss. 24 — 15 December 2016

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