关键词: 高压/
富氢化合物/
晶体结构/
超导电性
English Abstract
Structures and novel superconductivity of hydrogen-rich compounds under high pressures
Duan De-Fang,Ma Yan-Bin,
Shao Zi-Ji,
Xie Hui,
Huang Xiao-Li,
Liu Bing-Bing,
Cui Tian
1.State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, China
Fund Project:Project supported by the National Natural Science Foundation of China (Grant Nos. 51632002, 11674122, 51572108, 11204100, 11504127, 11634004) and the Program for Changjiang Scholars and Innovative Research Team in University of Ministry of Education of China (Grant No. IRT_15R23).Received Date:16 November 2016
Accepted Date:03 December 2016
Published Online:05 February 2017
Abstract:Metallic hydrogen can be realized theoretically at high pressure, which suggests that it will be a room-temperature superconductor due to the high vibrational frequencies of hydrogen atoms. However, the metallic state of hydrogen is not observed in experiment at up to 388 GPa. Scientists have been exploring various new ways to achieve hydrogen metallization. Hydrogen-rich compounds can be metallized at much lower pressures because of chemical pre-compression. Moreover, because such materials are dominated by hydrogen atoms, some novel properties can be found after metallization, such as high Tc superconductivity. Therefore, hydrogen-rich compounds are potential high-temperature superconductors, and this method is also believed to be an effective way to metalize hydrogen, which has aroused significant interest in lots of fields, such as physics, material science, etc. In a word, hydrogen-rich compounds are expected to become a new member of superconductor family:hydrogen-based superconductor. Very recently, the theoretical prediction and the successful experimental discovery of high-temperature superconductivity at 200 K in a sulfur hydride compound at high pressure have set a record, which inspired further efforts to study the superconductivity of hydrogen-rich compounds. The present review focuses on crystal structures, stabilities, interaction between atoms, metallization, and superconductivity of several typical hydrogen-rich compounds at high pressures. Furthermore, higher Tc superconductors can be expected to be found in hydrogen-rich compounds in the future.
Keywords: high pressure/
hydrogen-rich compounds/
crystal structure/
superconductivity
