Unveiling a Novel Insulator-to-Metal Transition in La2NiO4+δ:Challenging High-Temperature Superconductivity Claimed for Single-Layer Lanthanum Nickelates

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外文摘要：La2NiO4 has a similar structure to La2CuO4 and was proposed as a high-temperature superconductor based on magnetic-moment measurements decades ago.Nevertheless,with the exception for electrical resistance drop behavior of about 4 orders of magnitude that is claimed to originate from the superconductivity ever observed in Sr-doped La2NiO4,most electrical data reported to date in La2NiO4 system exhibit a trivial insulating ground state.Here,we definitively identify the similar electrical resistance drop behavior of more than 3 orders of magnitude in La2NiO4+δ.However,our extensive investigations reveal that this phenomenon is a novel insulator-to-metal transition,distinct from superconductivity.Intriguingly,compared to the weak magnetic-field effects,pressure can significantly suppress the transition and transform from the metallic to an insulating ground state,accompanied by an isostructural phase transition.Our work not only elucidates the fundamental properties of the metallic conducting ground state in La2NiO4+δ,but also critically challenges the notion of superconductivity in single-layer lanthanum nickelates.

作者：

吉云奇、王晓晗、李晓赫、唐雯婷、李新阳、王鑫、李芳菲、李亮、周强

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作者单位：

Synergetic Extreme Condition User Facility,State Key Laboratory of Superhard Materials,College of Physics,Jilin University,Changchun 130012,China

基金：

National Key Research and Development Program of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaJilin Provincial Science and Technology Development ProjectJilin Provincial Science and Technology Development ProjectProgram for Jilin University Science and Technology Innovative Research TeamFundamental Research Funds for the Central UniversitiesNational Major Science Facility Synergetic Extreme Condition User Facility Achievement Transformation Platform Construction

项目编号：

2023YFF080410012274168120741414210203020210402054GH20220101011JC2021-TD-052021FGWCXNLJSKJ01

出版年：

2024

DOI：

10.1088/0256-307X/41/9/097402

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)

CSTPCDEI

影响因子：0.515

ISSN：0256-307X

年,卷(期)：2024.41(9)