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High-pressure structures of germane (Gel4) have been explored through ab initio evolutionary methodology to reveal a metallic monoclinic structure of C2/c (4 molecules/cell).The C2/c structure consists of layer-like motifs containing novel "H2" units.Enthalpy calculations suggest a remarkably wide decomposition (Ge+H2) pressure range of 0-196 GPa, above which C2/c structure is stable.Perturbative linear response calculations for C2/c GeH4 at 220 GPa predict a large electron-phonon coupling parameter of 1.12 and the resulting superconducting critical temperature reaches 64 K.