Novel superconductivity in metallic SnH(4) under high pressure |
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Authors: | Tse J S Yao Y Tanaka K |
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Affiliation: | Department of Physics and Engineering Physics, University of Saskatchewan, Saskatoon, Canada, S7N 5E2. John.Tse@usask.ca |
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Abstract: | From first-principles calculations, a high-pressure metallic phase of SnH(4) with a novel layered structure intercalated by "H(2)" units is revealed. This structure is stable at pressure between 70 and 160 GPa. A remarkable feature of this structure is the presence of soft modes in the phonon band structure induced by Fermi surface nesting and Kohn anomalies that lead to very strong electron-phonon coupling. The application of the Allen-Dynes modified McMillan equation with the calculated electron-phonon coupling parameter lambda shows that a superconducting critical temperature close to 80 K can be achieved at 120 GPa. |
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