Chin. Phys. Lett.  2022, Vol. 39 Issue (12): 127403    DOI: 10.1088/0256-307X/39/12/127403
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
Predicted High-Temperature Superconductivity in Rare Earth Hydride ErH$_{2}$ at Moderate Pressure
Yiding Liu1,2, Qiang Fan3, Jianhui Yang1, Lili Wang4, Weibin Zhang5, and Gang Yao6,7*
1College of Mathematics and Physics, Leshan Normal University, Leshan 614004, China
2Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, China
3School of New Energy Materials and Chemistry, Leshan Normal University, Leshan 614004, China
4Institute of Computer Application, China Academy of Engineering Physics, Mianyang 621900, China
5College of Physics and Electronics Information, Yunnan Key Laboratory of Optoelectronic Information Technology, Yunnan Normal University, Kunming 650500, China
6School of Physical Science and Technology, Southwest University, Chongqing 400715, China
7Tsung-Dao Lee Institute, Shanghai Jiao Tong University, Shanghai 200240, China
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Yiding Liu, Qiang Fan, Jianhui Yang et al  2022 Chin. Phys. Lett. 39 127403
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Abstract Hydrides offer an opportunity to study high critical temperature (high-$T_{\rm c}$) superconductivity at experimentally achievable pressures. However, the pressure needed remains extremely high. Using density functional theory calculations, herein we demonstrate that a new rare earth hydride ErH$_{2}$ could be superconducting with $T_{\rm c} \sim 80$ K at 14.5 GPa, the lowest reported value for compressed hydrides to date. Intriguingly, due to Kondo destruction, superconductivity was prone to exist at 15 GPa. We also reveal an energy gap at 20 GPa on the background of normal metallic states. At 20 GPa, this compressed system could act as a host of superconductor judged from a sharp jump of spontaneous magnetic susceptibility with an evanescent spin density of state at Fermi level. Finally, electron pairing glue for ErH$_{2}$ at these three typical pressures was attributed to the antiferromagnetic spin fluctuation.
Received: 18 September 2022      Published: 04 December 2022
PACS:  74.10.+v (Occurrence, potential candidates)  
  74.70.Tx (Heavy-fermion superconductors)  
  74.20.Pq (Electronic structure calculations)  
  74.62.Fj (Effects of pressure)  
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https://cpl.iphy.ac.cn/10.1088/0256-307X/39/12/127403       OR      https://cpl.iphy.ac.cn/Y2022/V39/I12/127403
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Yiding Liu
Qiang Fan
Jianhui Yang
Lili Wang
Weibin Zhang
and Gang Yao
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