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Nano-engineering of electron correlation in oxide superlattices

  • Author(s): Laverock, J
  • Gu, M
  • Jovic, V
  • Lu, JW
  • Wolf, SA
  • Qiao, RM
  • Yang, W
  • Smith, KE
  • et al.
Abstract

© 2017 IOP Publishing Ltd. Oxide heterostructures and superlattices (SLs) have attracted a great deal of attention in recent years owing to the rich exotic properties encountered at their interfaces. We focus on the potential of tunable correlated oxides by investigating the spectral function of the prototypical correlated metal SrVO 3 , using soft x-ray absorption spectroscopy and resonant inelastic soft x-ray scattering to access both unoccupied and occupied electronic states, respectively. We demonstrate a remarkable level of tunability in the spectral function of SrVO 3 by varying its thickness within the SrVO 3 /SrTiO 3 SL, showing that the effects of electron correlation can be tuned from dominating the energy spectrum in a strongly correlated Mott–Hubbard insulator, towards a correlated metal. We show that the effects of dimensionality on the correlated properties of SrVO 3 are augmented by interlayer coupling, yielding a highly flexible correlated oxide that may be readily married with other oxide systems.

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