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Title: Interface-Induced Polarization in SrTiO 3 -LaCrO 3 Superlattices

Abstract

Epitaxial interfaces and superlattices comprised of polar and non-polar perovskite oxides have generated a good deal of interest because of the variety of novel properties they possess. In this work, we examine superlattices comprised of SrTiO3 (STO) and LaCrO3 (LCO) layers; we demonstrate that the differing band alignment of the polar LCO layer and the non-polar STO layer produces a ferroelectric phase transition throughout the STO layers of the superlattice. Through x-ray absorption near edge spectroscopy and aberration-corrected scanning transmission electron microscopy we show that the Ti cations are displaced off-center in the TiO6 octahedra along the superlattice growth direction. We also demonstrate that a built-in potential gradient exists within the STO and LCO layers via in situ x-ray photoelectron spectroscopy measurements. Density functional theory models of the system are in excellent agreement with these results, predicting both the ferroelectric octahedral distortion and the built-in electric field. These results represent a new avenue for research in perovskite superlattices, as two non-ferroelectric phases are shown to induce a bulk ferroelectric response due to interfacial phenomena.

Authors:
 [1];  [1];  [2];  [3];  [4];  [1];  [5];  [3];  [1];  [1]
  1. Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland WA 99352 USA
  2. Advanced Photon Source, Argonne National Laboratory, Argonne IL 60439 USA
  3. SuperSTEM, SciTech Daresbury Campus, Daresbury WA44AD UK
  4. Department of Materials, University of Oxford, Oxford OX13PH UK
  5. Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland WA 99352 USA
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science - Office of Basic Energy Sciences - Materials Sciences and Engineering Division; USDOE Office of Science - Office of Biological and Environmental Research
OSTI Identifier:
1392446
DOE Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article
Journal Name:
Advanced Materials Interfaces
Additional Journal Information:
Journal Volume: 3; Journal Issue: 10; Journal ID: ISSN 2196-7350
Publisher:
Wiley-VCH
Country of Publication:
United States
Language:
English
Subject:
Complex oxides; ferroelectrics; scanning transmission electron microscopy; superlattices; x-ray absorption spectroscopy; x-ray photoelectron spectroscopy

Citation Formats

Comes, Ryan B., Spurgeon, Steven R., Heald, Steve M., Kepaptsoglou, Despoina M., Jones, Lewys, Ong, Phuong Vu, Bowden, Mark E., Ramasse, Quentin M., Sushko, Peter V., and Chambers, Scott A. Interface-Induced Polarization in SrTiO 3 -LaCrO 3 Superlattices. United States: N. p., 2016. Web. doi:10.1002/admi.201500779.
Comes, Ryan B., Spurgeon, Steven R., Heald, Steve M., Kepaptsoglou, Despoina M., Jones, Lewys, Ong, Phuong Vu, Bowden, Mark E., Ramasse, Quentin M., Sushko, Peter V., & Chambers, Scott A. Interface-Induced Polarization in SrTiO 3 -LaCrO 3 Superlattices. United States. doi:10.1002/admi.201500779.
Comes, Ryan B., Spurgeon, Steven R., Heald, Steve M., Kepaptsoglou, Despoina M., Jones, Lewys, Ong, Phuong Vu, Bowden, Mark E., Ramasse, Quentin M., Sushko, Peter V., and Chambers, Scott A. Mon . "Interface-Induced Polarization in SrTiO 3 -LaCrO 3 Superlattices". United States. doi:10.1002/admi.201500779.
@article{osti_1392446,
title = {Interface-Induced Polarization in SrTiO 3 -LaCrO 3 Superlattices},
author = {Comes, Ryan B. and Spurgeon, Steven R. and Heald, Steve M. and Kepaptsoglou, Despoina M. and Jones, Lewys and Ong, Phuong Vu and Bowden, Mark E. and Ramasse, Quentin M. and Sushko, Peter V. and Chambers, Scott A.},
abstractNote = {Epitaxial interfaces and superlattices comprised of polar and non-polar perovskite oxides have generated a good deal of interest because of the variety of novel properties they possess. In this work, we examine superlattices comprised of SrTiO3 (STO) and LaCrO3 (LCO) layers; we demonstrate that the differing band alignment of the polar LCO layer and the non-polar STO layer produces a ferroelectric phase transition throughout the STO layers of the superlattice. Through x-ray absorption near edge spectroscopy and aberration-corrected scanning transmission electron microscopy we show that the Ti cations are displaced off-center in the TiO6 octahedra along the superlattice growth direction. We also demonstrate that a built-in potential gradient exists within the STO and LCO layers via in situ x-ray photoelectron spectroscopy measurements. Density functional theory models of the system are in excellent agreement with these results, predicting both the ferroelectric octahedral distortion and the built-in electric field. These results represent a new avenue for research in perovskite superlattices, as two non-ferroelectric phases are shown to induce a bulk ferroelectric response due to interfacial phenomena.},
doi = {10.1002/admi.201500779},
journal = {Advanced Materials Interfaces},
issn = {2196-7350},
number = 10,
volume = 3,
place = {United States},
year = {2016},
month = {2}
}

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