Novel Superconductivity in Metallic SnH4 under High Pressure
J. S. Tse, Y. Yao, K. Tanaka
DOI 10.1103/PhysRevLett.98.117004 · Physical Review Letters
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Abstract
From first-principles calculations, a high-pressure metallic phase of SnH4 with a novel layered structure intercalated by “H2” 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 λ shows that a superconducting critical temperature close to 80 K can be achieved at 120 GPa.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| SnH4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 58 | 70 GPa | unknown |
| SnH4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 73 | 120 GPa | unknown |
| SnH4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 74 | 160 GPa | unknown |
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