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Title
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Direct visualization of irreducible ferrielectricity in crystals
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Author
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Abstract
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| In solids, charge polarity can one-to-one correspond to spin polarity phenomenologically, e.g., ferroelectricity/ferromagnetism, antiferroelectricity/antiferromagnetism, and even dipole-vortex/magnetic-vortex, but ferrielectricity/ferrimagnetism kept telling a disparate story in microscopic level. Since the definition of a charge dipole involves more than one ion, there may be multiple choices for a dipole unit, which makes most ferrielectric orders equivalent to ferroelectric ones, i.e., this ferrielectricity is not necessary to be a real independent branch of polarity. In this work, by using the spherical aberration-corrected scanning transmission electron microscope, we visualize a nontrivial ferrielectric structural evolution in BaFe2Se3, in which the development of two polar sub-lattices is out-of-sync, for which we term it as irreducible ferrielectricity. Such irreducible ferrielectricity leads to a non-monotonic behavior for the temperature-dependent polarization, and even a compensation point in the ordered state. Our finding unambiguously distinguishes ferrielectrics from ferroelectrics in solids. |
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Language
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English
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Source (journal)
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npj Quantum Materials. - [S.l.]
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Publication
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[S.l.]
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Nature publishing group
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2020
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ISSN
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2397-4648
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DOI
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10.1038/S41535-020-00252-Y
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Volume/pages
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5
:1
(2020)
, p. 1-7
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Article Reference
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49
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ISI
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000551499400001
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Medium
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E-only publicatie
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Full text (Publisher's DOI)
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Full text (open access)
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