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Keywords = Friedel mates

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12 pages, 801 KiB  
Article
Intrinsic Ferroelectricity in Charge-Ordered Magnetite
by Manuel Angst, Shilpa Adiga, Semen Gorfman, Michael Ziolkowski, Jörg Strempfer, Christoph Grams, Manuel Pietsch and Joachim Hemberger
Crystals 2019, 9(11), 546; https://doi.org/10.3390/cryst9110546 - 23 Oct 2019
Cited by 6 | Viewed by 3643
Abstract
Single crystalline magnetite Fe3O4 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 [...] Read more.
Single crystalline magnetite Fe3O4 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 0.6 µC/cm2. Significant switching occurs only above a threshold field of about 3 kV/mm, and it occurs with a time delay of about 20 µs. 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 C c structure to its inversion twins, providing proof of intrinsic ferroelectricity in charge ordered magnetite. Full article
(This article belongs to the Special Issue Electronic Phenomena of Transition Metal Oxides)
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