The CdTiO3/BaTiO3 superlattice interface from first principles

The oxide interface has been studied extensively in the past decades and exhibits different physical properties from the constituent bulks. Using first-principles electronic structure calculations, we investigated the interface of CdTiO3/BaTiO3 (CTO/BTO) superlattice with ferroelectric BaTiO3. In th...

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Veröffentlicht in:Nanoscale 2021-05, Vol.13 (18), p.8506-8513
Hauptverfasser: Le, Fang, Chen, Chen, Sundaresan, A, Narayana, Chandrabhas, Ter-Oganessian, Nikita, Pyatakov, A P, Cao, Shixun, Zhang, Jincang, Ren, Wei
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Sprache:eng
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Zusammenfassung:The oxide interface has been studied extensively in the past decades and exhibits different physical properties from the constituent bulks. Using first-principles electronic structure calculations, we investigated the interface of CdTiO3/BaTiO3 (CTO/BTO) superlattice with ferroelectric BaTiO3. In this case, the conduction bands of CdTiO3 are composed of Cd-5s orbitals with low electron effective mass and nondegenerate dispersion, and thus expected to have high mobility. We predicted a controllable conductivity at the interface, and further analyzed how the polarization direction and strength affect the conductivity. We also explored the relationship between two components: thickness and polarization. Intriguingly, the total polarization in CTO/BTO might be even larger than that of ferroelectric bulk BaTiO3. Therefore, we found a way to maximize the superlattice polarization by increasing the fraction of the CdTiO3 layers, based on the interesting dependence of the total polarization and CTO/BTO ratio.
ISSN:2040-3364
2040-3372
DOI:10.1039/d1nr00374g