| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Unveiling a Novel Insulator-to-Metal Transition in La$_{2}$NiO$_{4+\delta}$: Challenging High-Temperature Superconductivity Claimed for Single-Layer Lanthanum Nickelates |
| Yunqi Ji, Xiaohan Wang, Xiaohe Li, Wenting Tang, Xinyang Li, Xin Wang, Fangfei Li*, Liang Li*, and Qiang Zhou |
| Synergetic Extreme Condition User Facility, State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, China |
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| Cite this article: |
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Yunqi Ji, Xiaohan Wang, Xiaohe Li et al 2024 Chin. Phys. Lett. 41 097402 |
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Abstract La$_{2}$NiO$_{4}$ has a similar structure to La$_{2}$CuO$_{4}$ 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 La$_{2}$NiO$_{4}$, most electrical data reported to date in La$_{2}$NiO$_{4}$ 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 La$_{2}$NiO$_{4+\delta}$. 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 La$_{2}$NiO$_{4+\delta}$, but also critically challenges the notion of superconductivity in single-layer lanthanum nickelates.
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Received: 13 May 2024
Published: 19 September 2024
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| PACS: |
74.70.-b
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(Superconducting materials other than cuprates)
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71.30.+h
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(Metal-insulator transitions and other electronic transitions)
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73.43.Nq
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(Quantum phase transitions)
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72.60.+g
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(Mixed conductivity and conductivity transitions)
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