Atomic-Scale Insights on Large-Misfit Heterointerfaces in LSMO/MgO/c-Al2O3
| Autor: | Ritesh Sachan, Soumya Mandal, Vidit Singh, Ashish Gupta, Braxton Hays Beavers, Jagdish Narayan |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
scanning transmission electron microscopy
lanthanum strontium manganese oxide heterointerfaces domain matching epitaxy large misfit systems Crystallography Condensed matter physics General Chemical Engineering Nucleation Heterojunction Condensed Matter Physics Epitaxy Atomic units Inorganic Chemistry QD901-999 Scanning transmission electron microscopy Monolayer General Materials Science Dislocation Spectroscopy |
| Zdroj: | Crystals, Vol 11, Iss 1493, p 1493 (2021) Crystals; Volume 11; Issue 12; Pages: 1493 |
| ISSN: | 2073-4352 |
| Popis: | Understanding the interfaces in heterostructures at an atomic scale is crucial in enabling the possibility to manipulate underlying functional properties in correlated materials. This work presents a detailed study on the atomic structures of heterogeneous interfaces in La0.7Sr0.3MnO3 (LSMO) film grown epitaxially on c-Al2O3 (0001) with a buffer layer of MgO. Using aberration-corrected scanning transmission electron microscopy, we detected nucleation of periodic misfit dislocations at the interfaces of the large misfit systems of LSMO/MgO and MgO/c-Al2O3 following the domain matching epitaxy paradigm. It was experimentally observed that the dislocations terminate with 4/5 lattice planes at the LSMO/MgO interface and with 12/13 lattice planes at the MgO/c-Al2O3 interface. This is consistent with theoretical predictions. Using the atomic-resolution image data analysis approach to generate atomic bond length maps, we investigated the atomic displacement in the LSMO/MgO and MgO/c-Al2O3 systems. Minimal presence of residual strain was shown at the respective interface due to strain relaxation following misfit dislocation formation. Further, based on electron energy-loss spectroscopy analysis, we confirmed an interfacial interdiffusion within two monolayers at both LSMO/MgO and MgO/c-Al2O3 interfaces. In essence, misfit dislocation configurations of the LSMO/MgO/c-Al2O3 system have been thoroughly investigated to understand atomic-scale insights on atomic structure and interfacial chemistry in these large misfit systems. |
| Databáze: | OpenAIRE |
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