Electronic Correlation and Pseudogap-Like Behavior of High-Temperature Superconductor La3Ni2O7

李义典 ¹杜宪 ¹曹延涛 ²裴翠颖 ³张明鑫 ³赵文轩 ¹翟恺熠 ¹许润哲 ¹柳仲楷 ⁴李志伟 ⁵赵金奎 ⁶李刚 ³齐彦鹏 ⁷郭汉杰 ⁶陈宇林 ⁸杨乐仙⁹

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作者信息

1. State Key Laboratory of Low Dimensional Quantum Physics,Department of Physics,Tsinghua University,Beijing 100084,China
2. Key Lab for Magnetism and Magnetic Materials of the Ministry of Education,Lanzhou University,Lanzhou 730000,China;Songshan Lake Materials Laboratory,Dongguan 523808,China
3. School of Physical Science and Technology,ShanghaiTech University,Shanghai 201210,China
4. School of Physical Science and Technology,ShanghaiTech University,Shanghai 201210,China;ShanghaiTech Laboratory for Topological Physics,Shanghai 200031,China
5. Key Lab for Magnetism and Magnetic Materials of the Ministry of Education,Lanzhou University,Lanzhou 730000,China
6. Songshan Lake Materials Laboratory,Dongguan 523808,China
7. School of Physical Science and Technology,ShanghaiTech University,Shanghai 201210,China;ShanghaiTech Laboratory for Topological Physics,Shanghai 200031,China;Shanghai Key Laboratory of High-Resolution Electron Microscopy,ShanghaiTech University,Shanghai 201210,China
8. School of Physical Science and Technology,ShanghaiTech University,Shanghai 201210,China;ShanghaiTech Laboratory for Topological Physics,Shanghai 200031,China;Department of Physics,Clarendon Laboratory,University of Oxford,Parks Road,Oxford OX1 3PU,UK
9. State Key Laboratory of Low Dimensional Quantum Physics,Department of Physics,Tsinghua University,Beijing 100084,China;Frontier Science Center for Quantum Information,Beijing 100084,China
折叠

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 La3Ni2O7 at high pressure,which provides a new platform to explore the uncon-ventional HTSC.In this work,using high-resolution angle-resolved photoemission spectroscopy and ab initio calculation,we systematically investigate the electronic structures of La3Ni2O7 at ambient pressure.Our ex-periments are in nice agreement with ab initio calculations after considering an orbital-dependent band renor-malization effect.The strong electron correlation effect pushes a flat band of dz2 orbital component below the Fermi level(EF),which is predicted to locate right at EF under high pressure.Moreover,the dx2-y2 band shows pseudogap-like behavior with suppressed spectral weight and diminished quasiparticle peak near EF.Our findings provide important insights into the electronic structure of La3Ni2O7,which will shed light on understanding of the unconventional superconductivity in nickelates.

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基金项目

国家重点研发计划(2022YFA1403100)

国家重点研发计划(2022YFA1403200)

国家自然科学基金(12275148)

国家自然科学基金(12004270)

国家自然科学基金(52272265)

Guangdong Basic and Applied Basic Research Foundation(2022B1515120020)

清华大学自主科研项目()

出版年

2024

中国物理快报(英文版)

中国科学院物理研究所,中国物理学会

中国物理快报(英文版)

CSTPCDCSCDEI

影响因子：0.515

ISSN：0256-307X

参考文献量64

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