Superconductivity in primitive hexagonal germanium
Jose Luis Martins, Marvin L. Cohen
DOI 10.1103/PhysRevB.37.3304 · Physical Review B
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Abstract
We present a first-principles calculation of the electron-phonon coupling constant λ (mass enchancement parameter) for the primitive hexagonal, high-pressure structural phase of Ge (75 GPa≲p≲105 GPa). Using the calculated value of λ, we estimate the superconducting transition temperature Tc to be in the range of 2 to 7 K. We discuss the contributions to λ from the different phonon modes and its dependence on the phonon frequency, electron-phonon matrix elements, and Fermi-surface nesting. The results are compared with previous calculations for primitive hexagonal Si.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Ge Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4 | 75 GPa | unknown |
| Si Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 8.2 | Pressure not reported | unknown |
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