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Interstitial oxygen as a source of p-type conductivity in hexagonal manganites

Author

Listed:
  • Sandra H. Skjærvø

    (NTNU Norwegian University of Science and Technology)

  • Espen T. Wefring

    (NTNU Norwegian University of Science and Technology)

  • Silje K. Nesdal

    (NTNU Norwegian University of Science and Technology)

  • Nikolai H. Gaukås

    (NTNU Norwegian University of Science and Technology)

  • Gerhard H. Olsen

    (NTNU Norwegian University of Science and Technology)

  • Julia Glaum

    (NTNU Norwegian University of Science and Technology)

  • Thomas Tybell

    (NTNU Norwegian University of Science and Technology)

  • Sverre M. Selbach

    (NTNU Norwegian University of Science and Technology)

Abstract

Hexagonal manganites, h-RMnO3 (R=Sc, Y, Ho–Lu), have been intensively studied for their multiferroic properties, magnetoelectric coupling, topological defects and electrically conducting domain walls. Although point defects strongly affect the conductivity of transition metal oxides, the defect chemistry of h-RMnO3 has received little attention. We use a combination of experiments and first principles electronic structure calculations to elucidate the effect of interstitial oxygen anions, Oi, on the electrical and structural properties of h-YMnO3. Enthalpy stabilized interstitial oxygen anions are shown to be the main source of p-type electronic conductivity, without reducing the spontaneous ferroelectric polarization. A low energy barrier interstitialcy mechanism is inferred from Density Functional Theory calculations to be the microscopic migration path of Oi. Since the Oi content governs the concentration of charge carrier holes, controlling the thermal and atmospheric history provides a simple and fully reversible way of tuning the electrical properties of h-RMnO3.

Suggested Citation

  • Sandra H. Skjærvø & Espen T. Wefring & Silje K. Nesdal & Nikolai H. Gaukås & Gerhard H. Olsen & Julia Glaum & Thomas Tybell & Sverre M. Selbach, 2016. "Interstitial oxygen as a source of p-type conductivity in hexagonal manganites," Nature Communications, Nature, vol. 7(1), pages 1-8, December.
  • Handle: RePEc:nat:natcom:v:7:y:2016:i:1:d:10.1038_ncomms13745
    DOI: 10.1038/ncomms13745
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