Enhancement of Superconductivity and Softening of Phonons in Superconducting Semiconductors

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Abstract
Following experiments on inhomogeneously doped semiconductors which exhibited an elevation of the superconducting transition temperature due to the softening of phonons associated with a phase transition, the phonon spectrum in these alloys of PbTe, SnTe, and GeTe has been computed and has been found to imply an elevation of Tc in the homogeneous alloys.

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