Interface-Induced Polarization in SrTiO3-LaCrO3 Superlattices

被引：23

作者：

Comes, Ryan B. ^{[1
]}

Spurgeon, Steven R. ^{[1
]}

Heald, Steve M. ^{[2
]}

Kepaptsoglou, Despoina M. ^{[3
]}

Jones, Lewys ^{[4
]}

Phuong Vu Ong ^{[1
]}

Bowden, Mark E. ^{[5
]}

Ramasse, Quentin M. ^{[3
]}

Sushko, Peter V. ^{[1
]}

Chambers, Scott A. ^{[1
]}

机构：

[1] Pacific Northwest Natl Lab, Phys & Computat Sci Directorate, Richland, WA 99352 USA

[2] Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA

[3] SuperSTEM, SciTech Daresbury Campus, Daresbury WA4 4AD, Cheshire, England

[4] Univ Oxford, Dept Mat, Oxford OX1 3PH, England

[5] Pacific Northwest Natl Lab, Environm Mol Sci Lab, Richland, WA 99352 USA

来源：

ADVANCED MATERIALS INTERFACES | 2016年 / 3卷 / 10期

基金：

英国工程与自然科学研究理事会;

关键词：

ELECTRON-GAS; OXIDE; ENHANCEMENT; FERROELECTRICITY; DISORDER; METALS;

D O I：

10.1002/admi.201500779

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Epitaxial interfaces and superlattices comprised of polar and non-polar perovskite oxides have generated considerable interest because they possess a range of desirable properties for functional devices. In this work, emergent polarization in superlattices of SrTiO3 (STO) and LaCrO3 (LCO) is demonstrated. By controlling the interfaces between polar LCO and non-polar STO, polarization is induced throughout the STO layers of the superlattice. Using X-ray absorption near-edge spectroscopy and aberration-corrected scanning transmission electron microscopy displacements of the Ti cations off-center within TiO6 octahedra along the superlattice growth direction are measured. This distortion gives rise to built-in potential gradients within the STO and LCO layers, as measured by in situ X-ray photoelectron spectroscopy. Density functional theory models explain the mechanisms underlying this behavior, revealing the existence of both an intrinsic polar distortion and a built-in electric field, which are due to alternately positively and negatively charged interfaces in the superlattice. This study paves the way for controllable polarization for carrier separation in multilayer materials and highlights the crucial role that interface structure plays in governing such behavior.

引用

页数：8

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