Electron-Phonon Interaction and Superconductivity in In-Tl Alloys

The superconducting tunneling results obtained by Dynes for the electron-phonon part α2(ω)F(ω) for indium-thallium alloys are examined in terms of both exact sum rules for alloy lattice dynamics and the self-consistent mass-defect theory. Detailed calculations are made of α2(ω)F(ω) for four alloy concentrations. Good over-all agreement is found between calculated and tunneling-derived results. Our analysis seems to support Dynes's conclusion …