Electrostatics liberating restrictions on ferroelectric by unification of polar discontinuity e-h+ layers and criteria of intrinsicality

Electron e - and hole h + layers at polar discontinuities as a thermodynamically stable state previously predicted are recently shown by many experiments. We discuss that these layers including those at SrTiO 3 /LaAlO 3 support our previous prediction of the substantially reduced electrostatic restr...

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Bibliographic Details
Published in:Ferroelectrics 2020-02, Vol.556 (1), p.29-36
Main Author: Watanabe, Yukio
Format: Article
Language:English
Subjects:
Adsorbates
conduction domain
Discontinuity
Electrostatics
Ferroelectric materials
Ferroelectricity
hyperferroelectric
Polar discontinuity
size effect
Size effects
Strontium titanates
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Summary:Electron e - and hole h + layers at polar discontinuities as a thermodynamically stable state previously predicted are recently shown by many experiments. We discuss that these layers including those at SrTiO 3 /LaAlO 3 support our previous prediction of the substantially reduced electrostatic restrictions on ferroelectricity such as size effect and domains when the origins of these conductions are intrinsic. For this, the criteria of the intrinsicality of these layers, i.e., not due to conventional mechanisms such as defects and adsorbates, are presented. In addition, we discuss that this reduction of the electrostatic restriction is the same as recently proposed hyperferroelectricity and show that hyperferroelectricity is a universal properties of general ferroelectric.
ISSN:0015-0193
1563-5112
DOI:10.1080/00150193.2020.1713336