Unveiling a novel metal-to-metal transition in LuH_(2):Critically challenging superconductivity claims in lutetium hydrides  

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 

机构地区：[1]Center for High-Pressure Science and Technology Advanced Research,Beijing 100094,China [2]Beijing National Laboratory for Condensed Matter Physics and Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China [3]Shanghai Key Laboratory of Material Frontiers Research in Extreme Environments(MFree),Shanghai Advanced Research in Physical Sciences(SHARPS),Shanghai 201203,China

出　　处：《Matter and Radiation at Extremes》2024年第3期65-73,共9页极端条件下的物质与辐射（英文）

基　　金：the National Key Research and Development Program of China(Grant Nos.2022YFA1402301 and 2018YFA0305703);the National Natural Science Foundation of China(Grant No.U2230401);the National Key R&D Program of China(Grant No.2021YFA1400200),;the National Natural Science Foundation of China(Grant Nos.12025408 and 11921004);the Strategic Priority Research Program of CAS(Grant No.XDB33000000).

摘　　要：Following the recent report by Dasenbrock-Gammon et al.[Nature 615,244–250(2023)]of near-ambient superconductivity in nitrogendoped lutetium trihydride(LuH_(3-δ)N_(ε)),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(LuH_(2)),resolving the ambiguity surrounding its composition.Under similar conditions(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 LuH_(2),distinct from superconductivity.Intriguingly,nitrogen doping exerts minimal impact on this transition.Our work not only elucidates the fundamental properties of LuH_(2)andLuH_(3),but also critically challenges the notion of superconductivity 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.

关 键 词：RESISTANCE HYDRIDE SUPERCONDUCTIVITY 

分 类 号：TG14[一般工业技术—材料科学与工程]