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2007 EPL 78 37003 (6pp) doi: 10.1209/0295-5075/78/37003
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Abstract. A combination of static and dynamical first-principles electronic calculations of silane, SiH4, at high pressure has revealed a novel monoclinic structure with C2/c symmetry. This high-pressure phase is metallic and composed of layers of SiH4 bridged by H bonds. Perturbative linear response calculations at 90 and 125 GPa predict large electron-phonon couplings yielding an electron-phonon coupling parameter λ close to 0.9. The application of McMillan equation gives a superconducting critical temperature (Tc) between 45 and 55 K.
PACS numbers: 74.10.+v, 74.70.Ad, 74.62.Fj
Print publication: Issue 3 (May 2007) |
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