| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Electronic Correlation and Pseudogap-Like Behavior of High-Temperature Superconductor La$_{3}$Ni$_2$O$_{7}$ |
| Yidian Li1†, Xian Du1†, Yantao Cao2,3†, Cuiying Pei4†, Mingxin Zhang4,
Wenxuan Zhao1, Kaiyi Zhai1, Runzhe Xu1, Zhongkai Liu4,5, Zhiwei Li2, Jinkui Zhao3, Gang Li4, Yanpeng Qi4,5,6*, Hanjie Guo3*, Yulin Chen4,5,7*, and Lexian Yang1,8* |
1State Key Laboratory of Low Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China
2Key Lab for Magnetism and Magnetic Materials of the Ministry of Education, Lanzhou University, Lanzhou 730000, China
3Songshan Lake Materials Laboratory, Dongguan 523808, China
4School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China
5ShanghaiTech Laboratory for Topological Physics, Shanghai 200031, China
6Shanghai Key Laboratory of High-Resolution Electron Microscopy, ShanghaiTech University, Shanghai 201210, China
7Department of Physics, Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU, UK
8Frontier Science Center for Quantum Information, Beijing 100084, China
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| Cite this article: |
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Yidian Li, Xian Du, Yantao Cao et al 2024 Chin. Phys. Lett. 41 087402 |
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Abstract High-temperature superconductivity (HTSC) remains one of the most challenging and fascinating mysteries in condensed matter physics. Recently, superconductivity with transition temperature exceeding liquid-nitrogen temperature is discovered in La$_{3}$Ni$_{2}$O$_{7}$ at high pressure, which provides a new platform to explore the unconventional HTSC. In this work, using high-resolution angle-resolved photoemission spectroscopy and ab initio calculation, we systematically investigate the electronic structures of La$_{3}$Ni$_{2}$O$_{7}$ at ambient pressure. Our experiments are in nice agreement with ab initio calculations after considering an orbital-dependent band renormalization effect. The strong electron correlation effect pushes a flat band of $d_{z^{2}}$ orbital component below the Fermi level ($E_{\rm F}$), which is predicted to locate right at $E_{\rm F}$ under high pressure. Moreover, the $d_{x^{2}-y^{2}}$ band shows pseudogap-like behavior with suppressed spectral weight and diminished quasiparticle peak near $E_{\rm F}$. Our findings provide important insights into the electronic structure of La$_{3}$Ni$_{2}$O$_{7}$, which will shed light on understanding of the unconventional superconductivity in nickelates.
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Received: 01 July 2024
Editors' Suggestion
Published: 23 July 2024
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| PACS: |
74.25.Jb
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(Electronic structure (photoemission, etc.))
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71.27.+a
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(Strongly correlated electron systems; heavy fermions)
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71.45.Lr
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(Charge-density-wave systems)
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79.60.-i
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(Photoemission and photoelectron spectra)
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