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Slow oxidation of magnetite nanoparticles elucidates the limits of the Verwey transition

Author

Listed:
  • Taehun Kim

    (Seoul National University
    Seoul National University)

  • Sangwoo Sim

    (Seoul National University)

  • Sumin Lim

    (Korea Advanced Institute of Science and Technology)

  • Midori Amano Patino

    (Kyoto University)

  • Jaeyoung Hong

    (Institute for Basic Science
    Seoul National University)

  • Jisoo Lee

    (Institute for Basic Science
    Seoul National University)

  • Taeghwan Hyeon

    (Institute for Basic Science
    Seoul National University)

  • Yuichi Shimakawa

    (Kyoto University)

  • Soonchil Lee

    (Korea Advanced Institute of Science and Technology)

  • J. Paul Attfield

    (University of Edinburgh)

  • Je-Geun Park

    (Seoul National University
    Seoul National University
    Seoul National University)

Abstract

Magnetite (Fe3O4) is of fundamental importance for the Verwey transition near TV = 125 K, below which a complex lattice distortion and electron orders occur. The Verwey transition is suppressed by chemical doping effects giving rise to well-documented first and second-order regimes, but the origin of the order change is unclear. Here, we show that slow oxidation of monodisperse Fe3O4 nanoparticles leads to an intriguing variation of the Verwey transition: an initial drop of TV to a minimum at 70 K after 75 days and a followed recovery to 95 K after 160 days. A physical model based on both doping and doping-gradient effects accounts quantitatively for this evolution between inhomogeneous to homogeneous doping regimes. This work demonstrates that slow oxidation of nanoparticles can give exquisite control and separation of homogeneous and inhomogeneous doping effects on the Verwey transition and offers opportunities for similar insights into complex electronic and magnetic phase transitions in other materials.

Suggested Citation

  • Taehun Kim & Sangwoo Sim & Sumin Lim & Midori Amano Patino & Jaeyoung Hong & Jisoo Lee & Taeghwan Hyeon & Yuichi Shimakawa & Soonchil Lee & J. Paul Attfield & Je-Geun Park, 2021. "Slow oxidation of magnetite nanoparticles elucidates the limits of the Verwey transition," Nature Communications, Nature, vol. 12(1), pages 1-6, December.
    • Handle: RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-26566-4
    DOI: 10.1038/s41467-021-26566-4
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    References listed on IDEAS

    as
    1. E. Pachoud & J. Cumby & G. Perversi & J. P. Wright & J. P. Attfield, 2020. "Site-selective doping of ordered charge states in magnetite," Nature Communications, Nature, vol. 11(1), pages 1-5, December.
    2. Mark S. Senn & Jon P. Wright & J. Paul Attfield, 2012. "Charge order and three-site distortions in the Verwey structure of magnetite," Nature, Nature, vol. 481(7380), pages 173-176, January.
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