Electronic Structure of Superconducting Infinite-Layer Lanthanum Nickelates
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arXiv
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| Main Authors: | , , , , , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2024
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| _version_ | 1866915116692275200 |
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| author | Sun, Wenjie Jiang, Zhicheng Xia, Chengliang Hao, Bo Li, Yueying Yan, Shengjun Wang, Maosen Liu, Hongquan Ding, Jianyang Liu, Jiayu Liu, Zhengtai Liu, Jishan Chen, Hanghui Shen, Dawei Nie, Yuefeng |
| author_facet | Sun, Wenjie Jiang, Zhicheng Xia, Chengliang Hao, Bo Li, Yueying Yan, Shengjun Wang, Maosen Liu, Hongquan Ding, Jianyang Liu, Jiayu Liu, Zhengtai Liu, Jishan Chen, Hanghui Shen, Dawei Nie, Yuefeng |
| contents | Revealing the momentum-resolved electronic structure of infinite-layer nickelates is essential for understanding this new class of unconventional superconductors, but has been hindered by the formidable challenges in improving the sample quality. In this work, we report for the first time the angle-resolved photoemission spectroscopy of superconducting La$_{0.8}$Sr$_{0.2}$NiO$_{2}$ films prepared by molecular beam epitaxy and ${\mathrm{\textit{in situ}}}$ atomic-hydrogen reduction. The measured Fermi topology closely matches theoretical calculations, showing a large Ni-$d_{x^2-y^2}$ derived Fermi sheet that evolves from hole-like to electron-like along $k_{z}$, and a three-dimensional (3D) electron pocket centered at Brillouin zone corner. The Ni-$d_{x^2-y^2}$ derived bands show a mass enhancement ($m^*/m_{\rm{DFT}}$) of 2-3,while the 3D electron band shows negligible band renormalization. Moreover, the Ni-$d_{x^2-y^2}$ derived states also display a band dispersion anomaly at higher binding energy, reminiscent of the waterfall feature and kinks observed in cuprates. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2403_07344 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Electronic Structure of Superconducting Infinite-Layer Lanthanum Nickelates Sun, Wenjie Jiang, Zhicheng Xia, Chengliang Hao, Bo Li, Yueying Yan, Shengjun Wang, Maosen Liu, Hongquan Ding, Jianyang Liu, Jiayu Liu, Zhengtai Liu, Jishan Chen, Hanghui Shen, Dawei Nie, Yuefeng Superconductivity Materials Science Strongly Correlated Electrons Revealing the momentum-resolved electronic structure of infinite-layer nickelates is essential for understanding this new class of unconventional superconductors, but has been hindered by the formidable challenges in improving the sample quality. In this work, we report for the first time the angle-resolved photoemission spectroscopy of superconducting La$_{0.8}$Sr$_{0.2}$NiO$_{2}$ films prepared by molecular beam epitaxy and ${\mathrm{\textit{in situ}}}$ atomic-hydrogen reduction. The measured Fermi topology closely matches theoretical calculations, showing a large Ni-$d_{x^2-y^2}$ derived Fermi sheet that evolves from hole-like to electron-like along $k_{z}$, and a three-dimensional (3D) electron pocket centered at Brillouin zone corner. The Ni-$d_{x^2-y^2}$ derived bands show a mass enhancement ($m^*/m_{\rm{DFT}}$) of 2-3,while the 3D electron band shows negligible band renormalization. Moreover, the Ni-$d_{x^2-y^2}$ derived states also display a band dispersion anomaly at higher binding energy, reminiscent of the waterfall feature and kinks observed in cuprates. |
| title | Electronic Structure of Superconducting Infinite-Layer Lanthanum Nickelates |
| topic | Superconductivity Materials Science Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2403.07344 |