Observation of Electride-like $s$ States Coexisting with Correlated $d$ Electrons in NdNiO$_2$
Fuente:
arXiv
Saved in:
| Main Authors: | , , , , , , , , , , , , , , , |
|---|---|
| Format: | Preprint |
| Published: |
2025
|
| Subjects: | |
| Online Access: | |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866914031097348096 |
|---|---|
| author | Li, Chihao Chen, Yutong Ding, Xiang Zhuang, Yezhao Guo, Nan Chen, Zhihui Fan, Yu Ye, Jiahao An, Zhitong Sangphet, Suppanut Tang, Shenglin Wang, Xiaoxiao Huang, Hai Xu, Haichao Feng, Donglai Peng, Rui |
| author_facet | Li, Chihao Chen, Yutong Ding, Xiang Zhuang, Yezhao Guo, Nan Chen, Zhihui Fan, Yu Ye, Jiahao An, Zhitong Sangphet, Suppanut Tang, Shenglin Wang, Xiaoxiao Huang, Hai Xu, Haichao Feng, Donglai Peng, Rui |
| contents | Despite exhibiting a similar $d_{x^2-y^2}$ band character to cuprates, infinite-layer nickelates host additional electron pockets that distinguish them from single-band cuprates. The elusive orbital origin of these electron pockets has led to competing theoretical scenarios. Here, using polarization-dependent and resonant angle-resolved photoemission spectroscopy (ARPES), we determine the orbital character of the Fermi surfaces in NdNiO$_2$. Our data reveal that the electron-like pocket arises predominantly from interstitial $s$ states, with negligible contributions from rare-earth 5$d$ and 4$f$ orbitals near the Fermi level. The observation of well-defined quantum well states indicates a uniform distribution of these interstitial electrons throughout the film thickness. By comparing with electronic structure of LaNiO$_2$, we find that the rare-earth element modulates the Ni-derived bands and hopping integrals through a chemical pressure effect. These findings clarify the role of rare-earth elements in shaping the low-energy electronic structure and establish the presence of electride-like interstitial $s$ states in a correlated oxide system, where electrons occupy lattice voids rather than atomic orbitals. The electride-like character offer new insight into the self-doping and superconductivity in infinite-layer nickelates. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_04378 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Observation of Electride-like $s$ States Coexisting with Correlated $d$ Electrons in NdNiO$_2$ Li, Chihao Chen, Yutong Ding, Xiang Zhuang, Yezhao Guo, Nan Chen, Zhihui Fan, Yu Ye, Jiahao An, Zhitong Sangphet, Suppanut Tang, Shenglin Wang, Xiaoxiao Huang, Hai Xu, Haichao Feng, Donglai Peng, Rui Superconductivity Materials Science Strongly Correlated Electrons 82D55 Despite exhibiting a similar $d_{x^2-y^2}$ band character to cuprates, infinite-layer nickelates host additional electron pockets that distinguish them from single-band cuprates. The elusive orbital origin of these electron pockets has led to competing theoretical scenarios. Here, using polarization-dependent and resonant angle-resolved photoemission spectroscopy (ARPES), we determine the orbital character of the Fermi surfaces in NdNiO$_2$. Our data reveal that the electron-like pocket arises predominantly from interstitial $s$ states, with negligible contributions from rare-earth 5$d$ and 4$f$ orbitals near the Fermi level. The observation of well-defined quantum well states indicates a uniform distribution of these interstitial electrons throughout the film thickness. By comparing with electronic structure of LaNiO$_2$, we find that the rare-earth element modulates the Ni-derived bands and hopping integrals through a chemical pressure effect. These findings clarify the role of rare-earth elements in shaping the low-energy electronic structure and establish the presence of electride-like interstitial $s$ states in a correlated oxide system, where electrons occupy lattice voids rather than atomic orbitals. The electride-like character offer new insight into the self-doping and superconductivity in infinite-layer nickelates. |
| title | Observation of Electride-like $s$ States Coexisting with Correlated $d$ Electrons in NdNiO$_2$ |
| topic | Superconductivity Materials Science Strongly Correlated Electrons 82D55 |
| url | https://arxiv.org/abs/2507.04378 |