Orientation-dependent superconductivity and electronic structure of the rare-earth metal/KTaO3 interfaces
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arXiv
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| Auteurs principaux: | , , , , , , , , , , , , |
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| Format: | Preprint |
| Publié: |
2023
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| _version_ | 1866911295514607616 |
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| author | Yang, Guowei Zhu, Weifan Zhang, Jiawen Zheng, Hao Wu, Yi Zhang, Huali Ye, Ge Su, Dajun Zhang, Yanan Cao, Chao Lu, Xin Yuan, Huiqiu Liu, Yang |
| author_facet | Yang, Guowei Zhu, Weifan Zhang, Jiawen Zheng, Hao Wu, Yi Zhang, Huali Ye, Ge Su, Dajun Zhang, Yanan Cao, Chao Lu, Xin Yuan, Huiqiu Liu, Yang |
| contents | The recent discovery of orientation-dependent superconductivity in KTaO3-based interfaces has attracted considerable interest, while the underlying origin remains an open question. Here we report a different approach to tune the interfacial electron gas and superconductivity by forming interfaces between rare-earth (RE) metals (RE being La, Ce, Eu) and KTaO3 substrates with different orientations. We found that the interfacial superconductivity is strongest for the Eu/KTaO3 interfaces, becomes weaker in La/KTaO3 and is absent in Ce/KTaO3. Using in-situ photoemission, we observed distinct valence bands associated with RE metals, as well as a pronounced orientation dependence in the interfacial electronic structure, which can be linked to the orientation-dependent superconductivity. The photoemission spectra show similar double-peak structures for the (111) and (110) oriented interfaces, with an energy separation close to the LO4 phonon of KTaO3. Detailed analyses suggest that this double-peak structure could be attributed to electron-phonon coupling, which might be important for the interfacial superconductivity. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2311_09588 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Orientation-dependent superconductivity and electronic structure of the rare-earth metal/KTaO3 interfaces Yang, Guowei Zhu, Weifan Zhang, Jiawen Zheng, Hao Wu, Yi Zhang, Huali Ye, Ge Su, Dajun Zhang, Yanan Cao, Chao Lu, Xin Yuan, Huiqiu Liu, Yang Superconductivity Materials Science The recent discovery of orientation-dependent superconductivity in KTaO3-based interfaces has attracted considerable interest, while the underlying origin remains an open question. Here we report a different approach to tune the interfacial electron gas and superconductivity by forming interfaces between rare-earth (RE) metals (RE being La, Ce, Eu) and KTaO3 substrates with different orientations. We found that the interfacial superconductivity is strongest for the Eu/KTaO3 interfaces, becomes weaker in La/KTaO3 and is absent in Ce/KTaO3. Using in-situ photoemission, we observed distinct valence bands associated with RE metals, as well as a pronounced orientation dependence in the interfacial electronic structure, which can be linked to the orientation-dependent superconductivity. The photoemission spectra show similar double-peak structures for the (111) and (110) oriented interfaces, with an energy separation close to the LO4 phonon of KTaO3. Detailed analyses suggest that this double-peak structure could be attributed to electron-phonon coupling, which might be important for the interfacial superconductivity. |
| title | Orientation-dependent superconductivity and electronic structure of the rare-earth metal/KTaO3 interfaces |
| topic | Superconductivity Materials Science |
| url | https://arxiv.org/abs/2311.09588 |