Unveiling a novel metal-to-metal transition in LuH2:Critically challenging superconductivity claims in lutetium hydrides

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外文摘要：Following the recent report by Dasenbrock-Gammon et al.[Nature 615,244-250(2023)]of near-ambient superconductivity in nitrogen-doped lutetium trihydride(LuH3-δNε),significant debate has emerged surrounding the composition and interpretation of the observed sharp resistance drop.Here,we meticulously revisit these claims through comprehensive characterization and investigations.We definitively identify the reported material as lutetium dihydride(LuH2),resolving the ambiguity surrounding its composition.Under similar condi-tions(270-295 K and 1-2 GPa),we replicate the reported sharp decrease in electrical resistance with a 30％success rate,aligning with the observations by Dasenbrock-Gammon et al.However,our extensive investigations reveal this phenomenon to be a novel pressure-induced metal-to-metal transition intrinsic to LuH2,distinct from superconductivity.Intriguingly,nitrogen doping exerts minimal impact on this transition.Our work not only elucidates the fundamental properties of LuH2 and LuH3,but also critically challenges the notion of supercon-ductivity in these lutetium hydride systems.These findings pave the way for future research on lutetium hydride systems,while emphasizing the crucial importance of rigorous verification in claims of ambient-temperature superconductivity.

作者：

Dong Wang、Ningning Wang、Caoshun Zhang、Chunsheng Xia、Weicheng Guo、Xia Yin、Kejun Bu、Takeshi Nakagawa、Jianbo Zhang、Federico Gorelli、Philip Dalladay-Simpson、Thomas Meier、Xujie Lü、Liling Sun、Jinguang Cheng、Qiaoshi Zeng、Yang Ding、Ho-kwang Mao

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作者单位：

Center for High Pressure Science and Technology Advanced Research,Beijing 100094,China

Beijing National Laboratory for Condensed Matter Physics and Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China

Center for High-Pressure Science and Technology Advanced Research,Beijing 100094,China

Shanghai Key Laboratory of Material Frontiers Research in Extreme Environments(MFree),Shanghai Advanced Research in Physical Sciences(SHARPS),Shanghai 201203,China

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出版年：

2024

DOI：

10.1063/5.0183701

极端条件下的物质与辐射(英文)

中国工程物理研究院科技信息中心

极端条件下的物质与辐射(英文)

ISSN：2468-2047

年,卷(期)：2024.9(3)