Ferroelectricity

doi:10.1002/9783527805310.ch4

Ferroelectrics 2017

DOI: 10.1002/9783527805310.ch4

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Ferroelectricity

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2022

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Cited by 2 publications

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Perovskite‐Type Hybrid Ferroelectric Semiconductors: A Potential Photosensitive Candidate Family for New Optoelectronic Applications

et al. 2022

Advanced Physics Research

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Ferroelectricity, characterized by the reversible switching of spontaneous polarization (P s ) under external electric field, exists in polar crystalline materials without a spatial-inversion symmetry. On account of inherent P s , ferroelectric materials show intriguing physical properties including piezoelectricity, pyroelectricity, second-order optical nonlinearity, and electro-optic effect. Such functions of ferroelectric materials have been widely used for practical applications. Recently, hybrid perovskites are emerging as a promising ferroelectric family that enables the combination and/or coupling of ferroelectricity, photoexcitation, and semiconductor behaviors. Due to the polarization deterioration caused by leakage current of photoexcited carriers, however, it is still a challenge to accomplish practical applications of ferroelectric semiconductors in the photoelectric field. In this review, the recent progress of ferroelectric system of perovskite-type hybrids with different dimensions is summarized. Primarily, a brief description of crystallographic symmetry breaking which is a fundamental criterion to creating ferroelectricity, is illuminated. The combination and/or coupling of photoelectric properties with ferroelectric P s is then presented. Finally, the further development tendency and possible application outlooks of this ferroelectric material system are prospected.

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Perovskite‐Type Hybrid Ferroelectric Semiconductors: A Potential Photosensitive Candidate Family for New Optoelectronic Applications

et al. 2022

Advanced Physics Research

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Avalanche criticality in LaAlO$$_3$$ and the effect of aspect ratio

Scott

Casals

Luo

et al. 2022

Sci Rep

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Ferroic domain dynamics, as a function of external stimuli, can be collectively described as scale-invariant avalanches characterised by a critical exponent that are sensitive to the complexity of the domain microstructure. The understanding and manipulation of these avalanches lies at the heart of developing novel applications such as neuromorphic computing. Here we combine in situ heating optical observations and mean-field analysis to investigate the collective domain behaviour in pure-ferroelastic lanthanum aluminate (LaAlO$$_3$$ 3 ) as a function of aspect ratio, the ratio of sample length to width, where the movement of the domains is predominantly driven by thermal stresses via thermal expansion/contraction during heat cycling. Our observations demonstrate that the aspect ratio induces (1) distinctive domain microstructures at room temperature, (2) a deviation of dynamical behaviour at high temperatures and (3) critical exponent mixing in the higher aspect ratio samples that accompanies this behaviour. While the critical exponents of each aspect ratio fall within mean-field predicted values, we highlight the effect that the aspect ratio has in inducing exponent mixing. Hence, furthering our understanding towards tuning and controlling avalanches which is crucial for fundamental and applied research.

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Ferroelectricity

Cited by 2 publications

References 446 publications

Perovskite‐Type Hybrid Ferroelectric Semiconductors: A Potential Photosensitive Candidate Family for New Optoelectronic Applications

Perovskite‐Type Hybrid Ferroelectric Semiconductors: A Potential Photosensitive Candidate Family for New Optoelectronic Applications

Avalanche criticality in LaAlO$$_3$$ and the effect of aspect ratio

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