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Charge-ordering transition in iron oxide Fe4O5 involving competing dimer and trimer formationстатья
Статья опубликована в высокорейтинговом журнале
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 26 сентября 2016 г.
- Авторы: Ovsyannikov S.V., Bykov M., Bykova E., Kozlenko D.P., Tsirlin A.A., Karkin A.E., Shchennikov V.V., Kichanov S.E., Abakumov Gou H.A.M, Egoavil R., Verbeeck J., McCammon C., Dyadkin V., Chernyshov D., van Smaalen S., Dubrovinsky L.S.
- Журнал: Nature Chemistry
- Том: 8
- Год издания: 2016
- Издательство: Nature Publishing Group
- Местоположение издательства: United Kingdom
- Первая страница: 501
- Последняя страница: 508
- DOI: 10.1038/NCHEM.2478
- Аннотация: Phase transitions that occur in materials, driven, for instance, by changes in temperature or pressure, can dramatically change the materials’ properties. Discovering new types of transitions and understanding their mechanisms is important not only from a fundamental perspective, but also for practical applications. Here we investigate a recently discovered Fe 4 O 5 that adopts an orthorhombic CaFe 3 O 5 -type crystal structure that features linear chains of Fe ions. On cooling below ∼150 K, Fe 4 O 5 undergoes an unusual charge-ordering transition that involves competing dimeric and trimeric ordering within the chains of Fe ions. This transition is concurrent with a significant increase in electrical resistivity. Magnetic- susceptibility measurements and neutron diffraction establish the formation of a collinear antiferromagnetic order above room temperature and a spin canting at 85 K that gives rise to spontaneous magnetization. We discuss possible mechanisms of this transition and compare it with the trimeronic charge ordering observed in magnetite below the Verwey transition temperature.
- Добавил в систему: Кичанов Сергей Евгеньевич