Absence of near-ambient superconductivity in LuH2±xNy

IF 50.5 1区 综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES Nature Pub Date : 2023-05-11 DOI:10.1038/s41586-023-06162-w
Xue Ming, Ying-Jie Zhang, Xiyu Zhu, Qing Li, Chengping He, Yuecong Liu, Tianheng Huang, Gan Liu, Bo Zheng, Huan Yang, Jian Sun, Xiaoxiang Xi, Hai-Hu Wen
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引用次数: 40

Abstract

A recent study demonstrated near-ambient superconductivity in nitrogen-doped lutetium hydride1. This stimulated a worldwide interest in exploring room-temperature superconductivity at low pressures. Here, by using a high-pressure and high-temperature synthesis technique, we have obtained nitrogen-doped lutetium hydride (LuH2±xNy), which has a dark-blue colour and a structure with the space group $$Fm\bar{3}m$$ as evidenced by X-ray diffraction. This structure is the same as that reported in ref. 1, with a slight difference in lattice constant. Raman spectroscopy of our samples also showed patterns similar to those observed in ref. 1. Energy-dispersive X-ray spectroscopy confirmed the presence of nitrogen in the samples. We observed a metallic behaviour from 350 K to 2 K at ambient pressure. On applying pressures from 2.1 GPa to 41 GPa, we observed a gradual colour change from dark blue to violet to pink-red. By measuring the resistance at pressures ranging from 0.4 GPa to 40.1 GPa, we observed a progressively improved metallic behaviour; however, superconductivity was not observed above 2 K. Temperature dependence of magnetization at high pressure shows a very weak positive signal between 100 K and 320 K, and the magnetization increases with an increase in magnetic field at 100 K. All of these are not expected for superconductivity above 100 K. Thus, we conclude the absence of near-ambient superconductivity in this nitrogen-doped lutetium hydride at pressures below 40.1 GPa. Nitrogen-doped lutetium hydrides LuH2±xNy synthesized using a high-pressure and high-temperature synthesis technique did not show near-ambient superconductivity at pressures below 40.1 GPa.

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LuH2±xNy 中不存在近环境超导电性
最近的一项研究表明,氮掺杂的氢化镥具有近环境超导性1。这激发了全世界对探索低压室温超导性的兴趣。在这里,我们利用高压高温合成技术获得了掺氮氢化镥(LuH2±xNy),它呈深蓝色,X 射线衍射证明其结构为空间群 $$Fm/bar{3}m$$。这种结构与参考文献 1 中报告的结构相同,只是在 l 值上略有不同。1 中报告的结构相同,只是晶格常数略有不同。我们样品的拉曼光谱也显示出与参考文献 1 中观察到的相似的模式。1.能量色散 X 射线光谱证实了样品中氮元素的存在。在环境压力下,我们观察到从 350 K 到 2 K 的金属特性。在施加 2.1 GPa 至 41 GPa 的压力时,我们观察到颜色从深蓝色逐渐变为紫色,再变为粉红色。通过测量 0.4 GPa 至 40.1 GPa 压力下的电阻,我们观察到金属特性逐渐改善;然而,在 2 K 以上没有观察到超导现象。在高压下,磁化的温度依赖性在 100 K 至 320 K 之间显示出非常微弱的正信号,在 100 K 时,磁化随着磁场的增加而增加。因此,我们得出结论,这种掺氮氢化镥在低于 40.1 GPa 的压力下不存在近环境超导现象。使用高压高温合成技术合成的掺氮镥氢化物 LuH2±xNy 在低于 40.1 GPa 的压力下没有显示出近环境超导性。
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来源期刊
Nature
Nature 综合性期刊-综合性期刊
CiteScore
90.00
自引率
1.20%
发文量
3652
审稿时长
3 months
期刊介绍: Nature is a prestigious international journal that publishes peer-reviewed research in various scientific and technological fields. The selection of articles is based on criteria such as originality, importance, interdisciplinary relevance, timeliness, accessibility, elegance, and surprising conclusions. In addition to showcasing significant scientific advances, Nature delivers rapid, authoritative, insightful news, and interpretation of current and upcoming trends impacting science, scientists, and the broader public. The journal serves a dual purpose: firstly, to promptly share noteworthy scientific advances and foster discussions among scientists, and secondly, to ensure the swift dissemination of scientific results globally, emphasizing their significance for knowledge, culture, and daily life.
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