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Pressure induced color change and evolution of metallic behavior in nitrogen-doped lutetium hydride

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Abstract

By applying pressures up to 42 GPa on the nitrogen-doped lutetium hydride (LuH2+xNy), we have found a gradual change of color from dark-blue to pink-violet in the pressure region of about 12 to 21 GPa. The temperature dependence of resistivity under pressures up to 50.5 GPa shows progressively optimized metallic behavior with pressure. Interestingly, in the pressure region for the color change, a clear decrease of resistivity is observed with the increase of pressure, which is accompanied by a clear increase of the residual resistivity ratio (RRR). Fitting to the low temperature resistivity gives exponents of about 2, suggesting a Fermi-liquid behavior in the low temperature region. The general behavior in a wide temperature region suggests that the electron-phonon scattering is still the dominant one. The magnetoresistance up to 9 T in the state under a pressure of 50.5 GPa shows an almost negligible effect, which suggests that the electric conduction in the pink-violet state is dominated by a single band. It is highly desired to have theoretical efforts in understanding the evolution of color and resistivity in this interesting system.

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Authors and Affiliations

  1. National Laboratory of Solid State Microstructures and Department of Physics, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, China

    Ying-Jie Zhang, Xue Ming, Qing Li, Xiyu Zhu, Bo Zheng, Yuecong Liu, Chengping He, Huan Yang & Hai-Hu Wen

Authors
  1. Ying-Jie Zhang
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  2. Xue Ming
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  3. Qing Li
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  4. Xiyu Zhu
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  5. Bo Zheng
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  6. Yuecong Liu
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  7. Chengping He
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  8. Huan Yang
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  9. Hai-Hu Wen
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Corresponding authors

Correspondence to Qing Li, Xiyu Zhu or Hai-Hu Wen.

Additional information

This work was supported by the National Key R&D Program of China (Grant No. 2022YFA1403201), the National Natural Science Foundation of China (Grant Nos. 12061131001, 12204231, 52072170, and 11927809), and the Strategic Priority Research Program (B) of Chinese Academy of Sciences (Grant No. XDB25000000).

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Zhang, YJ., Ming, X., Li, Q. et al. Pressure induced color change and evolution of metallic behavior in nitrogen-doped lutetium hydride. Sci. China Phys. Mech. Astron. 66, 287411 (2023). https://doi.org/10.1007/s11433-023-2109-4

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