Orbital-dependent electron correlation in double-layer nickelate La3Ni2O7

被引：87

作者：

Yang, Jiangang ^{[1
,2
]}

Sun, Hualei ^{[3
]}

Hu, Xunwu ^{[4
]}

Xie, Yuyang ^{[1
,2
]}

Miao, Taimin ^{[1
,2
]}

Luo, Hailan ^{[1
,2
]}

Chen, Hao ^{[1
,2
]}

Liang, Bo ^{[1
,2
]}

Zhu, Wenpei ^{[1
,2
]}

Qu, Gexing ^{[1
,2
]}

Chen, Cui-Qun ^{[4
]}

Huo, Mengwu ^{[4
]}

Huang, Yaobo ^{[5
]}

Zhang, Shenjin ^{[6
]}

Zhang, Fengfeng ^{[6
]}

Yang, Feng ^{[6
]}

Wang, Zhimin ^{[6
]}

Peng, Qinjun ^{[6
]}

Mao, Hanqing ^{[1
,2
,7
]}

Liu, Guodong ^{[1
,2
,7
]}

Xu, Zuyan ^{[6
]}

Qian, Tian ^{[1
]}

Yao, Dao-Xin ^{[4
]}

Wang, Meng ^{[4
]}

Zhao, Lin ^{[1
,2
,7
]}

Zhou, X. J. ^{[1
,2
,7
]}

机构：

[1] Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China

[2] Univ Chinese Acad Sci, Sch Phys Sci, Beijing 100049, Peoples R China

[3] Sun Yat Sen Univ, Sch Sci, Shenzhen 518107, Guangdong, Peoples R China

[4] Sun Yat Sen Univ, Sch Phys, Guangdong Prov Key Lab Magnetoelectr Phys & Device, Guangzhou 510275, Peoples R China

[5] Chinese Acad Sci, Shanghai Adv Res Inst, Shanghai Synchrotron Radiat Facil, Shanghai 201204, Peoples R China

[6] Chinese Acad Sci, Tech Inst Phys & Chem, Beijing 100190, Peoples R China

[7] Songshan Lake Mat Lab, Dongguan 523808, Guangdong, Peoples R China

来源：

NATURE COMMUNICATIONS | 2024年 / 15卷 / 01期

基金：

中国国家自然科学基金;

关键词：

NEUTRON-DIFFRACTION; SUPERCONDUCTIVITY; SPECTROSCOPY; INSULATOR; OXIDE;

D O I：

10.1038/s41467-024-48701-7

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

The latest discovery of high temperature superconductivity near 80 K in La3Ni2O7 under high pressure has attracted much attention. Many proposals are put forth to understand the origin of superconductivity. The determination of electronic structures is a prerequisite to establish theories to understand superconductivity in nickelates but is still lacking. Here we report our direct measurement of the electronic structures of La3Ni2O7 by high-resolution angle-resolved photoemission spectroscopy. The Fermi surface and band structures of La3Ni2O7 are observed and compared with the band structure calculations. Strong electron correlations are revealed which are orbital- and momentum-dependent. A flat band is formed from the Ni-3d(z2) orbitals around the zone corner which is similar to 50 meV below the Fermi level and exhibits the strongest electron correlation. In many theoretical proposals, this band is expected to play the dominant role in generating superconductivity in La3Ni2O7. Our observations provide key experimental information to understand the electronic structure and origin of high temperature superconductivity in La3Ni2O7.

引用

页数：8

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