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26 April 2024 |
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Direct Visualization of Irreducible Ferrielectricity in Crystals | | Kai Du
; Lei Guo
; Jin Peng
; Xing Chen
; Zheng-Nan Zhou
; Yang Zhang
; Ting Zheng
; Yan-Ping Liang
; Jun-Peng Lu
; Zhen-Hua Ni
; Shan-Shan Wang
; Gustaaf Van Tendeloo
; Ze Zhang
; Shuai Dong
; He Tian
; | | Date: |
25 Jul 2020 | | Abstract: | 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. | | Source: | arXiv, 2007.12828 | | Services: | Forum | Review | PDF | Favorites | |
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