Pressure tuning of charge ordering in iron oxide

Research output: Contribution to journalJournal article – Annual report year: 2018Researchpeer-review

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  • Author: Ovsyannikov, Sergey V.

    University of Bayreuth, Germany

  • Author: Bykov, Maxim

    University of Bayreuth, Germany

  • Author: Bykova, Elena

    University of Bayreuth, Germany

  • Author: Glazyrin, Konstantin

    Deutsches Elektronen-Synchrotron, Germany

  • Author: Manna, Rudra Sekhar

    Indian Institute of Technology Tirupati, India

  • Author: Tsirlin, Alexander A.

    University of Augsburg, Germany

  • Author: Cerantola, Valerio

    University of Bayreuth, Germany

  • Author: Kupenko, Ilya

    ESRF-The European Synchrotron, France

  • Author: Kurnosov, Alexander V.

    University of Bayreuth, Germany

  • Author: Kantor, Innokenty

    Neutrons and X-rays for Materials Physics, Department of Physics, Technical University of Denmark, Fysikvej, 2800, Kgs. Lyngby, Denmark

  • Author: Pakhomova, Anna S.

    Deutsches Elektronen-Synchrotron, Germany

  • Author: Chuvashova, Irina

    University of Bayreuth, Germany

  • Author: Chumakov, Aleksandr I.

    ESRF-The European Synchrotron, France

  • Author: Ruffer, Rudolf

    ESRF-The European Synchrotron, France

  • Author: McCammon, Catherine

    University of Bayreuth, Germany

  • Author: Dubrovinsky, Leonid S.

    University of Bayreuth, Germany

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A Verwey-type charge-ordering transition in magnetite at 120 K leads to the formation of linear units of three iron ions with one shared electron, called trimerons. The recently-discovered iron pentoxide (Fe4O5) comprising mixed-valent iron cations at octahedral chains, demonstrates another unusual charge-ordering transition at 150 K involving competing formation of iron trimerons and dimerons. Here, we experimentally show that applied pressure can tune the charge-ordering pattern in Fe4O5 and strongly affect the ordering temperature. We report two charge-ordered phases, the first of which may comprise both dimeron and trimeron units, whereas, the second exhibits an overall dimerization involving both the octahedral and trigonal-prismatic chains of iron in the crystal structure. We link the dramatic change in the charge-ordering pattern in the second phase to redistribution of electrons between the octahedral and prismatic iron chains, and propose that the average oxidation state of the iron cations can pre-determine a charge-ordering pattern.
Original languageEnglish
Article number4142
JournalNature Communications
Volume9
Issue number1
Number of pages11
ISSN2041-1723
DOIs
Publication statusPublished - 2018
CitationsWeb of Science® Times Cited: No match on DOI

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