Unraveling p-type and n-type interfaces in Superconducting Infinite-Layer Nickelate thin films
Fuente:
arXiv
Guardado en:
| Autores principales: | , , , , , , , |
|---|---|
| Formato: | Preprint |
| Publicado: |
2024
|
| Materias: | |
| Acceso en línea: | |
| Etiquetas: |
Agregar Etiqueta
Sin Etiquetas, Sea el primero en etiquetar este registro!
|
| _version_ | 1866929499128463360 |
|---|---|
| author | Raji, Aravind Gutiérrez-Llorente, Araceli Zhang, Dongxin Li, Xiaoyan Bibes, Manuel Iglesias, Lucia Rueff, Jean-Pascal Gloter, Alexandre |
| author_facet | Raji, Aravind Gutiérrez-Llorente, Araceli Zhang, Dongxin Li, Xiaoyan Bibes, Manuel Iglesias, Lucia Rueff, Jean-Pascal Gloter, Alexandre |
| contents | After decades of research, superconductivity was finally found in nickel-based analogs of superconducting cuprates, with infinite-layer (IL) structure. These results are so far restricted to thin films in the case of IL-nickelates. Therefore, the nature of the interface with the substrate, and how it couples with the thin film properties is still an open question. Here, using scanning transmission electron microscopy (STEM)- electron energy loss spectroscopy (EELS) and four-dimensional (4D)-STEM, a novel chemically sharp p-type interface is observed in a series of superconducting IL-praseodymium nickelate samples, and a comparative study is carried out with the previously reported n-type interface obtained in other samples. Both interfaces have strong differences, with the p-type interface being highly polar. In combination with ab-initio calculations, we find that the influence of the interface on the electronic structure is local, and does not extend beyond 2-3 unit cells into the thin film. This decouples the direct influence of the interface in driving the superconductivity, and indicates that the IL-nickelate thin films do not have a universal interface model. Insights into the spatial hole-distribution in SC samples, provided by monochromated EELS and total reflection-hard x-ray photoemission spectroscopy, suggest that this particular distribution might be directly influencing superconductivity. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2405_02186 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Unraveling p-type and n-type interfaces in Superconducting Infinite-Layer Nickelate thin films Raji, Aravind Gutiérrez-Llorente, Araceli Zhang, Dongxin Li, Xiaoyan Bibes, Manuel Iglesias, Lucia Rueff, Jean-Pascal Gloter, Alexandre Superconductivity Materials Science After decades of research, superconductivity was finally found in nickel-based analogs of superconducting cuprates, with infinite-layer (IL) structure. These results are so far restricted to thin films in the case of IL-nickelates. Therefore, the nature of the interface with the substrate, and how it couples with the thin film properties is still an open question. Here, using scanning transmission electron microscopy (STEM)- electron energy loss spectroscopy (EELS) and four-dimensional (4D)-STEM, a novel chemically sharp p-type interface is observed in a series of superconducting IL-praseodymium nickelate samples, and a comparative study is carried out with the previously reported n-type interface obtained in other samples. Both interfaces have strong differences, with the p-type interface being highly polar. In combination with ab-initio calculations, we find that the influence of the interface on the electronic structure is local, and does not extend beyond 2-3 unit cells into the thin film. This decouples the direct influence of the interface in driving the superconductivity, and indicates that the IL-nickelate thin films do not have a universal interface model. Insights into the spatial hole-distribution in SC samples, provided by monochromated EELS and total reflection-hard x-ray photoemission spectroscopy, suggest that this particular distribution might be directly influencing superconductivity. |
| title | Unraveling p-type and n-type interfaces in Superconducting Infinite-Layer Nickelate thin films |
| topic | Superconductivity Materials Science |
| url | https://arxiv.org/abs/2405.02186 |