The semimetal antimony (Sb) element doped into hydrogen has been performed theoretically to explored high-pressure crystal structure and superconductivity of antimony hydrides. The unexpected stoichiometry SbH4 with P63/mmc symmetry is found to have most negative enthalpy and embody the coexistence of covalent and ionic bonds. It is a metallic phase and stable in the pressure ranges of 127-300 GPa. Furthermore, a superconducting critical temperature (Tc) of 106 K is obtained at 150 GPa by employing the Allen-Dynes modified McMillan equation. In addition, an extrusive distinguishing feature is the presence of soft phonon modes, which is primary contribution to the strength of electron-phonon coupling.
@article{arxiv.1506.03889,
title = {The unexpected binding and superconductivity in SbH4 at high pressure},
author = {Yanbin Ma and Defang Duan and Da Li and Yunxian Liu and Fubo Tian and Xiaoli Huang and Zhonglong Zhao and Hongyu Yu and Bingbing Liu and Tian Cui},
journal= {arXiv preprint arXiv:1506.03889},
year = {2015}
}