Superconducting high pressure phase of germane

Guoying Gao, Artem R. Oganov, Aitor Bergara, Miguel Martinez-Canales, Tian Cui, Toshiaki Iitaka, Yanming Ma, Guangtian Zou

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229 Citations (Scopus)

Abstract

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

Original languageEnglish
Article number107002
JournalPhysical Review Letters
Volume101
Issue number10
DOIs
Publication statusPublished - 3 Sep 2008
Externally publishedYes

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