Absence of near-ambient superconductivity in LuH2±xNy

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 and Hai-Hu Wen ()
Additional contact information
Xue Ming: Nanjing University
Ying-Jie Zhang: Nanjing University
Xiyu Zhu: Nanjing University
Qing Li: Nanjing University
Chengping He: Nanjing University
Yuecong Liu: Nanjing University
Tianheng Huang: Nanjing University
Gan Liu: Nanjing University
Bo Zheng: Nanjing University
Huan Yang: Nanjing University
Jian Sun: Nanjing University
Xiaoxiang Xi: Nanjing University
Hai-Hu Wen: Nanjing University

Nature, 2023, vol. 620, issue 7972, 72-77

Abstract: 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 $$Fm\bar{3}m$$ F m 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.

Date: 2023
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DOI: 10.1038/s41586-023-06162-w

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