Interface-induced polarization in SrTiO3-LaCrO3 superlattices
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 demonst...
| Main Authors: | , , , , , , , , , |
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| Format: | Journal article |
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Wiley
2016
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| _version_ | 1826273992958279680 |
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| author | Comes, R Spurgeon, S Seald, S Kepaptsoglou, D Jones, L Ong, P Bowden, M Ramasse, Q Sushko, P Chambers, S |
| author_facet | Comes, R Spurgeon, S Seald, S Kepaptsoglou, D Jones, L Ong, P Bowden, M Ramasse, Q Sushko, P Chambers, S |
| author_sort | Comes, R |
| collection | OXFORD |
| description | 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 nonpolar 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. |
| first_indexed | 2024-03-06T22:36:40Z |
| format | Journal article |
| id | oxford-uuid:5a20b79e-dd66-43a7-a616-da1ae37e27a6 |
| institution | University of Oxford |
| last_indexed | 2024-03-06T22:36:40Z |
| publishDate | 2016 |
| publisher | Wiley |
| record_format | dspace |
| spelling | oxford-uuid:5a20b79e-dd66-43a7-a616-da1ae37e27a62022-03-26T17:13:59ZInterface-induced polarization in SrTiO3-LaCrO3 superlatticesJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:5a20b79e-dd66-43a7-a616-da1ae37e27a6Symplectic Elements at OxfordWiley2016Comes, RSpurgeon, SSeald, SKepaptsoglou, DJones, LOng, PBowden, MRamasse, QSushko, PChambers, SEpitaxial 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 nonpolar 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. |
| spellingShingle | Comes, R Spurgeon, S Seald, S Kepaptsoglou, D Jones, L Ong, P Bowden, M Ramasse, Q Sushko, P Chambers, S Interface-induced polarization in SrTiO3-LaCrO3 superlattices |
| title | Interface-induced polarization in SrTiO3-LaCrO3 superlattices |
| title_full | Interface-induced polarization in SrTiO3-LaCrO3 superlattices |
| title_fullStr | Interface-induced polarization in SrTiO3-LaCrO3 superlattices |
| title_full_unstemmed | Interface-induced polarization in SrTiO3-LaCrO3 superlattices |
| title_short | Interface-induced polarization in SrTiO3-LaCrO3 superlattices |
| title_sort | interface induced polarization in srtio3 lacro3 superlattices |
| work_keys_str_mv | AT comesr interfaceinducedpolarizationinsrtio3lacro3superlattices AT spurgeons interfaceinducedpolarizationinsrtio3lacro3superlattices AT sealds interfaceinducedpolarizationinsrtio3lacro3superlattices AT kepaptsogloud interfaceinducedpolarizationinsrtio3lacro3superlattices AT jonesl interfaceinducedpolarizationinsrtio3lacro3superlattices AT ongp interfaceinducedpolarizationinsrtio3lacro3superlattices AT bowdenm interfaceinducedpolarizationinsrtio3lacro3superlattices AT ramasseq interfaceinducedpolarizationinsrtio3lacro3superlattices AT sushkop interfaceinducedpolarizationinsrtio3lacro3superlattices AT chamberss interfaceinducedpolarizationinsrtio3lacro3superlattices |