High-pressure spectroscopic studies on solid germane

ORAL

Abstract

We performed extensive spectroscopic studies on dense germane up to 110 GPa. Pressure -- temperature phase diagram has been established from Raman and infrared spectra. There is no any trace of decomposition of Ge and H$_{2}$ over the pressure range studied. Infrared measurements provide spectroscopic evidence of the metallization of this material at pressure around 16 GPa which is much lower than that observed in sister system - silane. Angle-dispersive powder x-ray diffraction studies reveal that only a structural transition is accompanying when germane enters its metallic state. These experimental observations are examined by \textit{ab initio} calculations. The theoretical results of the electronic, lattice dynamical, and superconducting properties of metallic phase of this material are also presented.

*This work was supported by the DOE, NSF, HKGRC, and NSFC.

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Authors

  • Xiao-Jia Chen

    • Carnegie Institution of Washington,Washington, DC 20015
    • Geophysical Laboratory, Carnegie Institution of Washington, Washington, DC 20015

  • Viktor V. Struzhkin

    • Carnegie Institution of Washington,Washington, DC 20015
    • Geophysical Laboratory, Carnegie Institution of Washington, Washington, DC 20015

  • Zhen-Xian Liu

    • Carnegie Institution of Washington
    • Carnegie Institution of Washington,Washington, DC 20015

  • Muhetaer Aihaiti

    • Carnegie Institution of Washington,Washington, DC 20015

  • Y. Meng

    • Carnegie Institution of Washington,Washington, DC 20015
    • HPCAT

  • Ho-kwang Mao

    • Carnegie Institution of Washington
    • Carnegie Institution of Washington,Washington, DC 20015
    • Geophysical Laboratory, Carnegie Institution of Washington, Washington, DC 20015

  • Russell J. Hemley

    • Carnegie Institution of Washington,Washington, DC 20015
    • Geophysical Laboratory, Carnegie Institution of Washington, Washington, DC 20015

  • Chao Zhang

    • City University of Hong Kong, Kowloon, Hong Kong

  • Rui-Qin Zhang

    • City University of Hong Kong, Kowloon, Hong Kong

  • Yanling Li

    • The Chinese University of Hong Kong, Shatin, Hong Kong

  • Hai-Qing Lin

    • The Chinese University of Hong Kong, Shatin, N.T., Hong Kong
    • The Chinese University of Hong Kong, Shatin, Hong Kong
    • Department of Physics and the Institute of Theoretical Physics, the Chinese University of Hong Kong
    • Department of Physics, The Chinese University of Hong Kong