Theoretical Study on Fe-Se-H Hydrides under High Pressure
作者：Chen, J. Y., Xue, X. Y., Chen, H. L., Liu, H. F., Zang, Q. J., & Lu, W. C
關鍵字：high pressure, superconductor
論文來源：期刊
發表時間：2019年
Iron hydrides can be formed under high pressure and have special physical and chemical properties. Structures and stabilities of FeXSeHY (X = 1?2, Y = 1?6) hydrides under high pressure were studied using a genetic algorithm method combined with DFT calculations. Further, using triangular phase diagrams, we found that the C2/m-FeSeH is most stable among FeSeH1?6 at 150 GPa. Among Fe2SeH1?6, the enthalpy values of Amm2- and I4/mmm-Fe2SeH2 phases are the lowest at 150 and 200 GPa, respectively, and the Immm-Fe2SeH phase is the lowest in enthalpy at 250?300 GPa. The predicted superconducting transition temperatures (Tc) show that C2/m-FeSeH and Amm2-Fe2SeH2 have almost no superconductivity, while the predicted Tc values of I4/mmm-Fe2SeH2 and Immm-Fe2SeH at 150 GPa are 8.6 and 1.1 K, respectively, and that of Pm-FeSeH6 at 150 GPa is 34.4 K.