Journal Article

FZJ-2019-05206

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Intrinsic Ferroelectricity in Charge-Ordered Magnetite

Angst, M. (Corresponding author)FZJ* ; Adiga, S. ; Gorfman, S. ; Ziolkowski, M. ; Strempfer, J. ; Grams, C. ; Pietsch, M. ; Hemberger, J.

2019
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Please use a persistent id in citations: http://hdl.handle.net/2128/23150  doi:10.3390/cryst9110546

Abstract: Single crystalline magnetite Fe 3 O 4 was investigated at low temperatures in the charge ordered state by electric measurements and time-resolved diffraction with voltage applied in-situ. Dielectric spectroscopy indicates relaxor ferroelectric characteristics, with polarization switching observably only at sufficiently low temperatures and in a suitably chosen time-window. PUND measurements with a ms time scale indicate a switchable polarization of about 0.6μC/cm2 . Significant switching occurs only above a threshold field of about 3kV/mm , and it occurs with a time delay of about 20μs . The time-resolved diffraction experiment yields, for sufficiently high voltage pulses, a systematic variation by about 0.1 % of the intensity of the ( 2,2¯,10¯¯¯¯ ) Bragg reflection, which is attributed to structural switching of domains of the non-centrosymmetric Cc structure to its inversion twins, providing proof of intrinsic ferroelectricity in charge ordered magnetite.

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Contributing Institute(s):

1. Streumethoden (JCNS-2)
2. Streumethoden (PGI-4)
3. JARA-FIT (JARA-FIT)

Research Program(s):

1. 144 - Controlling Collective States (POF3-144) (POF3-144)
2. 524 - Controlling Collective States (POF3-524) (POF3-524)
3. 6212 - Quantum Condensed Matter: Magnetism, Superconductivity (POF3-621) (POF3-621)
4. 6213 - Materials and Processes for Energy and Transport Technologies (POF3-621) (POF3-621)
5. 6G4 - Jülich Centre for Neutron Research (JCNS) (POF3-623) (POF3-623)

Experiment(s):

1. PETRA Beamline P09 (PETRA III)

Appears in the scientific report 2019

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Database coverage:
; ; ; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; DOAJ Seal ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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