Pressure-induced hydride superconductors above 200 K

Zhang Xiaohua; Zhao Yaping; Li Fei; Yang Guochun

doi:10.1063/5.0065287

Volume 6 Issue 6

Nov. 2021

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Zhang Xiaohua, Zhao Yaping, Li Fei, Yang Guochun. Pressure-induced hydride superconductors above 200 K[J]. Matter and Radiation at Extremes, 2021, 6(6): 068201. doi: 10.1063/5.0065287

Citation:

Zhang Xiaohua, Zhao Yaping, Li Fei, Yang Guochun. Pressure-induced hydride superconductors above 200 K[J]. Matter and Radiation at Extremes, 2021, 6(6): 068201. doi: 10.1063/5.0065287

Zhang Xiaohua, Zhao Yaping, Li Fei, Yang Guochun. Pressure-induced hydride superconductors above 200 K[J]. Matter and Radiation at Extremes, 2021, 6(6): 068201. doi: 10.1063/5.0065287

Citation:

Zhang Xiaohua, Zhao Yaping, Li Fei, Yang Guochun. Pressure-induced hydride superconductors above 200 K[J]. Matter and Radiation at Extremes, 2021, 6(6): 068201. doi: 10.1063/5.0065287

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Pressure-induced hydride superconductors above 200 K

doi: 10.1063/5.0065287

Zhang Xiaohua^{1, 2
,},
Zhao Yaping¹,
Li Fei¹,
Yang Guochun^{1, 2
,
,
,}

1.
State Key Laboratory of Metastable Materials Science and Technology and Key Laboratory for Microstructural Material Physics of Hebei Province, School of Science, Yanshan University, Qinhuangdao 066004, China
2.
Centre for Advanced Optoelectronic Functional Materials Research and Key Laboratory for UV Light-Emitting Materials and Technology of Ministry of Education, Northeast Normal University, Changchun 130024, China

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Corresponding author: a)Author to whom correspondence should be addressed: yanggc468@nenu.edu.cn
Received Date: 2021-07-31
Accepted Date: 2021-09-15

Available Online: 2021-11-01

Publish Date: 2021-11-15

Abstract

Abstract

Although it was proposed many years ago that compressed hydrogen should be a high-temperature superconductor, the goal of room-temperature superconductivity has so far remained out of reach. However, the successful synthesis of the theoretically predicted hydrides H₃S and LaH₁₀ with high superconducting transition temperatures T_C provides clear guidance for achieving this goal. The existence of these superconducting hydrides also confirms the utility of theoretical predictions in finding high-T_C superconductors. To date, numerous hydrides have been studied theoretically or experimentally, especially binary hydrides. Interestingly, some of them exhibit superconductivity above 200 K. To gain insight into these high-T_C hydrides (>200 K) and facilitate further research, we summarize their crystal structures, bonding features, and electronic properties, as well as their superconducting mechanism. Based on hydrogen structural motifs, covalent H₃S with isolated hydrogen and several clathrate superhydrides (LaH₁₀, YH₉, and CaH₆) are highlighted. Other predicted hydrides with various H-cages and two-dimensional H motifs are also discussed. Finally, we present a systematic discussion of the common features, current problems, and future challenges of these high-T_C hydrides.

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