Electronic Structure of LaNiO<sub>3</sub><sub> </sub>Thin Films and (111)-Oriented LaNiO<sub>3</sub>/LaMnO<sub>3</sub> Heterostructures Probed by ARPES

ORAL

Abstract

We report measurements of the electronic structure of (111)-oriented [LaNiO3/LaMnO3] superlattices and LaNiO3 epitaxial thin films both (111) and (001) oriented by means of angle resolved photoemission spectroscopy (ARPES). For thin films we observe a 3D Fermi surface with an electron pocket at the Brillouin zone center and hole pockets at the zone vertices. Taking advantage of the large electron escape depth of soft x-ray ARPES we measure the Fermi surface of buried nickelate layers in superlattices. Heterostructures with thick LaNiO3 layers are metallic and present a similar electronic structure to thin films. However, as the thickness of the LaNiO3 is reduced to 7 monolayers the superlattices become insulating. These heterostructures do not show a marked redistribution of spectral weight in momentum space but exhibit a pseudogap of ≈ 50 meV. APL Materials 5, 016101 (2017).

*This work was supported by the Swiss National Science Foundation through Ambizione (Grant No. PZ00P2 161327)

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Presenters

  • Flavio Bruno

    • DQMP, University of Geneva
    • University of Geneva

Authors

  • Flavio Bruno

    • DQMP, University of Geneva
    • University of Geneva

  • Siobhan McKeown Walker

    • DQMP, University of Geneva
    • University of Geneva

  • W. Tromp

    • University of Geneva

  • Marta Gibert

    • Univ of Geneva
    • University of Geneva
    • Université de Genève

  • O. Peil

    • University of Geneva

  • Alberto De la Torre

    • University of Geneva
    • California Institute of Technology
    • Department of Physics, California Institute of Technology

  • S. Ricco

    • DQMP, University of Geneva
    • University of Geneva

  • Z. Wang

    • Swiss Light Source, Paul Scherrer Institute.

  • Sara Catalano

    • Department of Quantum Matter Physics, University of Geneva
    • University of Geneva
    • Université de Genève
    • Univ of Geneva

  • Anna Tamai

    • DQMP, University of Geneva
    • University of Geneva
    • Univ of Geneva

  • F. Bisti

    • Swiss Light Source, Paul Scherrer Institute.

  • V. Strocov

    • Paul Scherrer Institute
    • Swiss Light Source, Paul Scherrer Institute.
    • Paul Scherrer Institut
    • Swiss Light Source, Paul Scherrer Institut

  • Jean-Marc Triscone

    • Univ of Geneva
    • University of Geneva
    • Université de Genève

  • Felix Baumberger

    • DQMP, University of Geneva
    • University of Geneva
    • Univ of Geneva