Abstract
Electron tunneling has been used to study the electron-phonon interaction in PbCd proximity effect samples by injecting electrons into Pb side. For Pb thicknesses ranging from 950 to 330 Å, the phonon structure occurs at the same energy as bulk Pb and the magnitude of the structure scales as T c 2 . The shape of the phonon spectral function, α 2 F( ω), remains essentially unchanged even though T c has been depressed by 35%.
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