Unraveling nano-scale effects of topotactic reduction in LaNiO$_2$ crystals
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arXiv
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| Auteurs principaux: | , , , , , , |
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| Format: | Preprint |
| Publié: |
2024
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| _version_ | 1866916330115956736 |
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| author | Wu, Yu-Mi Puphal, Pascal Isobe, Masahiko Keimer, Bernhard Hepting, Matthias Suyolcu, Y. Eren van Aken, Peter A. |
| author_facet | Wu, Yu-Mi Puphal, Pascal Isobe, Masahiko Keimer, Bernhard Hepting, Matthias Suyolcu, Y. Eren van Aken, Peter A. |
| contents | Infinite-layer nickelates stand as a promising frontier in the exploration of unconventional superconductivity. Their synthesis through topotactic oxygen reduction from the parent perovskite phase remains a complex and elusive process. This study delves into the nano-scale effects of the topotactic lattice transformation within LaNiO$_2$ crystals. Leveraging high-resolution scanning transmission electron microscopy and spectroscopy, our investigations uncover a panorama of structural alterations, including grain boundaries and coherent twin boundaries, triggered by reduction-induced transformations. In addition, our analyses unveil the formation of an oxygen-rich disordered transition phase encircling impurities and pervading crystalline domains, and the internal strain is accommodated by grain boundary formation. By unraveling these nano-scale effects, our findings provide insights into the microscopic intricacies of the topotactic reduction process elucidating the transition from the perovskite to the infinite-layer phase within nickelate bulk crystals. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2407_13886 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Unraveling nano-scale effects of topotactic reduction in LaNiO$_2$ crystals Wu, Yu-Mi Puphal, Pascal Isobe, Masahiko Keimer, Bernhard Hepting, Matthias Suyolcu, Y. Eren van Aken, Peter A. Materials Science Superconductivity Infinite-layer nickelates stand as a promising frontier in the exploration of unconventional superconductivity. Their synthesis through topotactic oxygen reduction from the parent perovskite phase remains a complex and elusive process. This study delves into the nano-scale effects of the topotactic lattice transformation within LaNiO$_2$ crystals. Leveraging high-resolution scanning transmission electron microscopy and spectroscopy, our investigations uncover a panorama of structural alterations, including grain boundaries and coherent twin boundaries, triggered by reduction-induced transformations. In addition, our analyses unveil the formation of an oxygen-rich disordered transition phase encircling impurities and pervading crystalline domains, and the internal strain is accommodated by grain boundary formation. By unraveling these nano-scale effects, our findings provide insights into the microscopic intricacies of the topotactic reduction process elucidating the transition from the perovskite to the infinite-layer phase within nickelate bulk crystals. |
| title | Unraveling nano-scale effects of topotactic reduction in LaNiO$_2$ crystals |
| topic | Materials Science Superconductivity |
| url | https://arxiv.org/abs/2407.13886 |