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100 1 _ |a Angst, Manuel
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245 _ _ |a Intrinsic Ferroelectricity in Charge-Ordered Magnetite
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520 _ _ |a 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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700 1 _ |a Adiga, Shilpa
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700 1 _ |a Gorfman, Semen
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700 1 _ |a Ziolkowski, Michael
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700 1 _ |a Strempfer, Jörg
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700 1 _ |a Grams, Christoph
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700 1 _ |a Pietsch, Manuel
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700 1 _ |a Hemberger, Joachim
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773 _ _ |a 10.3390/cryst9110546
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