期刊
SOLID STATE COMMUNICATIONS
卷 149, 期 43-44, 页码 1944-1946出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ssc.2009.07.044
关键词
Superconductors; x-ray scattering; Electron-phonon interaction; High pressure
The structure of BaH2 at high pressure up to 58 GPa has been investigated with synchrotron powder x-ray diffraction. A structural phase transition from the low pressure Ni-2 In structure to a simple hexagonal structure, which started at 40 GPa and was completed at approximately 45 GPa, was confirmed. A loss of Raman signal in this pressure range suggests that an insulator to metal transition has occurred. This observation is corroborated with first-principles calculations. The investigation of the electron-phonon coupling shows that the metallic phase is a very weak superconductor with an estimated superconducting critical temperature T-c in the range of mK. (C) 2009 Elsevier Ltd. All rights reserved.
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