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Coupling between octahedral rotations and local polar displacements in WO3/ReO3 superlattices

Coupling between octahedral rotations and local polar displacements in WO3/ReO3 superlattices

Authors :
Schick, Joseph T.
Jiang, Lai
Saldana-Greco, Diomedes
Rappe, Andrew M.
Source :
Phys. Rev. B 89, 195304 (2014)
Publication Year :
2014

Abstract

We model short-period superlattices of WO$_3$ and ReO$_3$ with first-principles calculations. In fully-relaxed superlattices, we observe that octahedral tilts about an axis in the planes of the superlattices do not propagate from one material, despite the presence of the corner-shared oxygen atoms. However, we find that octahedral rotation is enhanced within WO$_3$ layers in cases in which strain couples with native antiferroelectric displacements of tungsten within their octahedral cages. Resulting structures remain antiferroelectric with low net global polarization. Thermodynamic analysis reveals that superlattices with sufficiently thick ReO$_3$ layers, the absolute number being three or more layers and the Re fraction $\geq 50\%$, tend to be more stable than the separated material phases and also show enhanced octahedral rotations in the WO$_3$ layers.<br />Comment: 7 pages, 7 figures

Details

Database :
arXiv
Journal :
Phys. Rev. B 89, 195304 (2014)
Publication Type :
Report
Accession number :
edsarx.1405.3699
Document Type :
Working Paper
Full Text :
https://doi.org/10.1103/PhysRevB.89.195304