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Suppression of the Verwey Transition by Charge Trapping
Forschungszentrum Julich, Peter Grunberg Inst PGI 6, D-52425 Julich, Germany.
Helmholtz Zentrum Berlin Mat & Energie, Albert Einstein Str 15, D-12489 Berlin, Germany.
Univ Duisburg Essen, Fak Phys, Lotharstr 1, D-47048 Duisburg, Germany;Univ Duisburg Essen, Ctr Nanointegrat Duisburg Essen CENIDE, Lotharstr 1, D-47048 Duisburg, Germany.
Univ Duisburg Essen, Fak Phys, Lotharstr 1, D-47048 Duisburg, Germany;Univ Duisburg Essen, Ctr Nanointegrat Duisburg Essen CENIDE, Lotharstr 1, D-47048 Duisburg, Germany;Univ Tabriz, Fac Chem, Tabriz, Iran.
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2018 (English)In: Annalen der Physik, ISSN 0003-3804, E-ISSN 1521-3889, Vol. 530, no 3, article id 1700363Article in journal (Refereed) Published
Abstract [en]

The Verwey transition in Fe3O4 nanoparticles with a mean diameter of 6.3 nm is suppressed after capping the particles with a 3.5 nm thick shell of SiO2. By X-ray absorption spectroscopy and its associated X-ray magnetic circular dichroism this suppression can be correlated to localized Fe2+ states and a reduced double exchange visible in different site-specific magnetization behavior in high magnetic fields. The results are discussed in terms of charge trapping at defects in the Fe3O4/ SiO2 interface and the consequent difficulties in the formation of the common phases of Fe3O4. By comparison to X-ray absorption spectra of bare Fe3O4 nanoparticles in course of the Verwey transition, particular changes in the spectral shape could be correlated to changes in the number of unoccupied d states for Fe ions at different lattice sites. These findings are supported by density functional theory calculations.

Place, publisher, year, edition, pages
WILEY-V C H VERLAG GMBH , 2018. Vol. 530, no 3, article id 1700363
Keywords [en]
magnetite, nanoparticles, Verwey transition, X-ray absorption spectroscopy
National Category
Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:uu:diva-354514DOI: 10.1002/andp.201700363ISI: 000428350500010OAI: oai:DiVA.org:uu-354514DiVA, id: diva2:1233127
Funder
German Research Foundation (DFG), WE 2623/3-1Available from: 2018-07-16 Created: 2018-07-16 Last updated: 2018-07-16Bibliographically approved

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