Interface control of ferroelectricity in LaNiO3-BaTiO3 superlattices
| Autor: | Sheng Ju, Yin-Zhong Wu, Hai-Shuang Lu, Tian-Yi Cai |
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| Rok vydání: | 2014 |
| Předmět: | |
| Zdroj: | AIP Advances, Vol 4, Iss 8, Pp 087109-087109-7 (2014) |
| ISSN: | 2158-3226 |
| DOI: | 10.1063/1.4892610 |
| Popis: | LaNiO$_{3}$-BaTiO$_{3}$ superlattices with different types of interfaces are studied from first-principles density-functional theory. It is revealed that the ferroelectricity in the superlattice with (NiO$_2$)$^-$/(BaO)$^0$ interfaces is enhanced from that of the superlattice with (LaO)$^+$/(TiO$_2$)$^0$ interfaces. The origin lies at the polar discontinuity at the interface, which makes the holes localized within the (NiO$_2$)$^-$/(BaO)$^0$ interface, but drives a penetration of electrons into BaTiO$_3$ component near (LaO)$^+$/(TiO$_2$)$^0$ interface. Our calculations demonstrate an effective avenue to the robust ferroelectricity in BaTiO$_3$ ultrathin films. 14 pages, 6 figures |
| Databáze: | OpenAIRE |
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