首页|Cuprate-like electronic structures in infinite-layer nickelates with substantial hole dopings

Cuprate-like electronic structures in infinite-layer nickelates with substantial hole dopings

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Superconducting infinite-layer(IL)nickelates offer a new platform for investigating the long-standing problem of high-temperature superconductivity.Many models were proposed to understand the superconducting mechanism of nickelates based on the calculated electronic structure,and the multiple Fermi surfaces and multiple orbitals involved create complications and controversial conclusions.Over the past five years,the lack of direct measurements of the electronic structure has hindered the understanding of nickelate superconductors.Here we fill this gap by directly resolving the electronic structures of the parent compound LaNiO2 and superconducting La0.8Ca0.2NiO2 using angle-resolved photoemission spectroscopy.We find that their Fermi surfaces consist of a quasi-2D hole pocket and a 3D electron pocket at the Brillouin zone corner,whose volumes change upon Ca doping.The Fermi surface topology and band dispersion of the hole pocket closely resemble those observed in hole-doped cuprates.However,the cuprate-like band exhibits significantly higher hole doping in superconducting La0.8Ca0.2NiO2 compared to superconducting cuprates,highlighting the disparities in the electronic states of the superconducting phase.Our observations highlight the novel aspects of the IL nickelates,and pave the way toward the microscopic understanding of the IL nickelate family and its superconductivity.

unconventional superconductivitynickelate superconductorsoxide MBEARPESelectronic structuresuperconducting phase diagram

Xiang Ding、Yu Fan、Xiaoxiao Wang、Chihao Li、Zhitong An、Jiahao Ye、Shenglin Tang、Minyinan Lei、Xingtian Sun、Nan Guo、Zhihui Chen、Suppanut Sangphet、Yilin Wang、Haichao Xu、Rui Peng、Donglai Feng

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Advanced Materials Laboratory,State Key Laboratory of Surface Physics,and Department of Physics,Fudan University,Shanghai 200433,China

School of Emerging Technology,University of Science and Technology of China,Hefei 230026,China

New Cornerstone Science Laboratory,University of Science and Technology of China,Hefei 230026,China

Shanghai Research Center for Quantum Sciences,Shanghai 201315,China

National Synchrotron Radiation Laboratory and School of Nuclear Science and Technology,University of Science and Technology of China,Hefei 230026,China

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National Natural science Foundation of ChinaNational Natural science Foundation of ChinaNational Natural science Foundation of ChinaNational Key R&D Program of the Ministry of Science and Technology(MOST)of ChinaNew Cornerstone Science FoundationInnovation Program for Quantum Science and TechnologyShanghai Municipal Science and Technology Major ProjectChina National Postdoctoral Program for Innovative TalentsNational Natural Science Foundation of China ME2 project

1207407412274085121743652023YFA14063002021ZD03028032019SHZDZX01BX2023007811227902

2024

10.1093/nsr/nwae194

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ISSN：
年,卷(期)：2024.11(8)