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

Sandra H. Skjærvø, Espen T. Wefring, Silje K. Nesdal, Nikolai H. Gaukås, Gerhard H. Olsen, Julia Glaum, Thomas Tybell and Sverre M. Selbach ()
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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

Nature Communications, 2016, vol. 7, issue 1, 1-8

Abstract: 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.

Date: 2016
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DOI: 10.1038/ncomms13745

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