Electronic structure of superconducting infinite-layer lanthanum nickelates
Revealing the momentum-resolved electronic structure of infinite-layer nickelates is essential for understanding this class of unconventional superconductors but has been hindered by the formidable challenges in improving the sample quality. In this work, we report the angle-resolved photoemission spectroscopy of superconducting La<sub>0.8</sub>Sr<sub>0.2</sub>NiO<sub>2</sub> films prepared by molecular beam epitaxy and in situ atomic-hydrogen reduction. The measured Fermi topology closely matches theoretical calculations, showing a large Ni [Formula: see text]-derived Fermi sheet that evolves from hole-like to electron-like along <i>k<sub>z</sub></i> and a three-dimensional (3D) electron pocket centered at the Brillouin zone corner. The Ni [Formula: see text]-derived bands show a mass enhancement (<i>m</i>*/<i>m</i><sub>DFT</sub>) of 2 to 3, while the 3D electron band shows negligible band renormalization. Moreover, the Ni [Formula: see text]-derived states also display a band dispersion anomaly at higher binding energy, reminiscent of the waterfall feature and kinks observed in cuprates.
Authors
- Jianyang Ding (ORCID: https://orcid.org/0000-0001-8337-4179)
- Zhengtai Liu (ORCID: https://orcid.org/0000-0002-3328-165X)
- Dawei Shen (ORCID: https://orcid.org/0000-0003-2402-7956)
- Chengliang Xia (ORCID: https://orcid.org/0000-0003-0743-2001)
- Zhicheng Jiang (ORCID: https://orcid.org/0000-0001-7407-1176)
- Bo Hao
- Hanghui Chen (ORCID: https://orcid.org/0000-0002-4371-931X)
- Jiayu Liu
- J. S. Liu (ORCID: https://orcid.org/0000-0003-0181-6426)
- Wenjie Sun (ORCID: https://orcid.org/0000-0003-2512-3907)
- Hongquan Liu (ORCID: https://orcid.org/0000-0003-2198-0696)
- Yueying Li (ORCID: https://orcid.org/0000-0002-8815-4236)
- Shengjun Yan
- Maosen Wang
Institutions
- University of Science and Technology of China (CN)
- Chinese Academy of Sciences (CN)
- New York University Shanghai (CN)
- Brown University (US)
- Southern University of Science and Technology (CN)
- Shanghai Advanced Research Institute (CN)
- Collaborative Innovation Center of Advanced Microstructures (CN)
- Shanghai Institute of Microsystem and Information Technology (CN)
- National Synchrotron Radiation Laboratory (CN)
- New York University (US)
- Nanjing University (CN)
Publication Details
- Journal
- Science Advances
- Published
- 2025-01-22
- DOI
- https://doi.org/10.1126/sciadv.adr5116
- Citations
- 27
- Primary Topic
- Physics of Superconductivity and Magnetism
- Type
- article
- Field-Weighted Citation Impact
- 32.71
Funders
- York University
- Government of Jiangsu Province
- Science and Technology Commission of Shanghai Municipality
- Natural Science Foundation of Anhui Province