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

吉云奇 ¹王晓晗 ¹李晓赫 ¹唐雯婷 ¹李新阳 ¹王鑫 ¹李芳菲 ¹李亮 ¹周强¹

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作者信息

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

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.

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基金项目

National Key Research and Development Program of China(2023YFF0804100)

National Natural Science Foundation of China(12274168)

National Natural Science Foundation of China(12074141)

National Natural Science Foundation of China(42102030)

Jilin Provincial Science and Technology Development Project(20210402054GH)

Jilin Provincial Science and Technology Development Project(20220101011JC)

Program for Jilin University Science and Technology Innovative Research Team(2021-TD-05)

Fundamental Research Funds for the Central Universities()

National Major Science Facility Synergetic Extreme Condition User Facility Achievement Transformation Platform Construction(2021FGWCXNLJSKJ01)

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51

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