دورية أكاديمية
Direct observation of strong surface reconstruction in partially reduced nickelate films
| العنوان: | Direct observation of strong surface reconstruction in partially reduced nickelate films |
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| المؤلفون: | Yang, Chao, Pons, Rebecca, Sigle, Wilfried, Wang, Hongguang, Benckiser, Eva, Logvenov, Gennady, Keimer, Bernhard, van Aken, Peter A. |
| المساهمون: | the European Union's Horizon 2020 research and innovation programme |
| المصدر: | Nature Communications ; volume 15, issue 1 ; ISSN 2041-1723 |
| بيانات النشر: | Springer Science and Business Media LLC |
| سنة النشر: | 2024 |
| مصطلحات موضوعية: | General Physics and Astronomy, General Biochemistry, Genetics and Molecular Biology, General Chemistry, Multidisciplinary |
| الوصف: | The polarity of a surface can affect the electronic and structural properties of oxide thin films through electrostatic effects. Understanding the mechanism behind these effects requires knowledge of the atomic structure and electrostatic characteristics at the surface. In this study, we use annular bright-field imaging to investigate the surface structure of a Pr 0.8 Sr 0.2 NiO 2+ x (0 < x < 1) film. We observe a polar distortion coupled with octahedral rotations in a fully oxidized Pr 0.8 Sr 0.2 NiO 3 sample, and a stronger polar distortion in a partially reduced sample. Its spatial depth extent is about three unit cells from the surface. Additionally, we use four-dimensional scanning transmission electron microscopy (4D-STEM) to directly image the local atomic electric field surrounding Ni atoms near the surface and discover distinct valence variations of Ni atoms, which are confirmed by atomic-resolution electron energy-loss spectroscopy (EELS). Our results suggest that the strong surface reconstruction in the reduced sample is closely related to the formation of oxygen vacancies from topochemical reduction. These findings provide insights into the understanding and evolution of surface polarity at the atomic level. |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| DOI: | 10.1038/s41467-023-44616-x |
| الإتاحة: | https://doi.org/10.1038/s41467-023-44616-xTest https://www.nature.com/articles/s41467-023-44616-x.pdfTest https://www.nature.com/articles/s41467-023-44616-xTest |
| حقوق: | https://creativecommons.org/licenses/by/4.0Test ; https://creativecommons.org/licenses/by/4.0Test |
| رقم الانضمام: | edsbas.AA242301 |
| قاعدة البيانات: | BASE |
| DOI: | 10.1038/s41467-023-44616-x |
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