Article révisé par les pairs
Résumé : The low-temperature heat capacity of each of a series of indium-tin alloys containing 0-13 at.% tin has been measured, and the density of electronic states N(EF) and the Debye temperature Θ0 evaluated. The electron-phonon coupling constant λ was calculated from the super-conducting critical temperature Tc and Θ0, and was used to derive the band-structure density of states Nbs(EF). Both Nbs(EF) and λ increase more rapidly with increasing tin content above 9 at.% tin than below 9 at.%. These results are interpreted in terms of the Brillouin-zone-boundary-Fermi-surface interaction that has been postulated to explain the behavior of the lattice parameters and Tc. Comparison with band-structure calculations and experimental Fermi-surface studies for pure indium suggest that new parts of the Fermi surface appear in the third zone at this electron concentration. © 1971 The American Physical Society.