Observation of non-superconducting phase changes in nitrogen doped lutetium hydrides

Xiangzhuo Xing, Chao Wang, Linchao Yu, Jie Xu, Chutong Zhang, Mengge Zhang, Song Huang, Xiaoran Zhang, Yunxian Liu, Bingchao Yang, Xin Chen, Yongsheng Zhang, Jiangang Guo, Zhixiang Shi, Yanming Ma, Changfeng Chen and Xiaobing Liu ()
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Xiangzhuo Xing: Qufu Normal University
Chao Wang: Qufu Normal University
Linchao Yu: Qufu Normal University
Jie Xu: Qufu Normal University
Chutong Zhang: Qufu Normal University
Mengge Zhang: Qufu Normal University
Song Huang: Qufu Normal University
Xiaoran Zhang: Qufu Normal University
Yunxian Liu: Qufu Normal University
Bingchao Yang: Qufu Normal University
Xin Chen: Qufu Normal University
Yongsheng Zhang: Qufu Normal University
Jiangang Guo: Chinese Academy of Sciences
Zhixiang Shi: Southeast University
Yanming Ma: Jilin University
Changfeng Chen: University of Nevada
Xiaobing Liu: Qufu Normal University

Nature Communications, 2023, vol. 14, issue 1, 1-9

Abstract: Abstract The recent report of near-ambient superconductivity and associated color changes in pressurized nitrogen doped lutetium hydride has triggered worldwide interest and raised major questions about the nature and underlying physics of these latest claims. Here we report synthesis and characterization of high-purity nitrogen doped lutetium hydride LuH2±xNy. We find that pressure conditions have notable effects on Lu-N and Lu-NH chemical bonding and the color changes likely stem from pressure-induced electron redistribution of nitrogen/vacancies and interaction with the LuH2 framework. No superconducting transition is found in all the phases at temperatures 1.8-300 K and pressures 0-38 GPa. Instead, we identify a notable temperature-induced resistance anomaly of electronic origin in LuH2±xNy, which is most pronounced in the pink phase and may have been erroneously interpreted as a sign of superconducting transition. This work establishes key benchmarks for nitrogen doped lutetium hydrides, allowing an in-depth understanding of its novel pressure-induced phase changes.

Date: 2023
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DOI: 10.1038/s41467-023-41777-7

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