Phys. Rev. B 37, 3304–3307 (1988)Superconductivity in primitive hexagonal germaniumReceived 24 August 1987; published in the issue dated 1 March 1988 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. © 1988 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.37.3304
DOI:
10.1103/PhysRevB.37.3304
PACS:
74.10.+v, 63.20.Kr, 74.20.Fg
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