Electron–phonon interaction in aluminum point contacts

Point contact spectra have been measured for bulk single-crystals and polycrystalline films of aluminum. Typical spectra have maxima at 20.6±0.2; 31.8±0.2; and 36.6±0.2 meV, a shoulder near 24 meV, and an edge near 41−43 meV. Deviations from the typical form of the spectrum are due to anisotropies in the electron–phonon interaction in Al. The locations of unusual spectral features and the qualitative intensity ratio of the TA and LA bands in the point contact spectra agree well with the calculations of Hayman and Carbotte.

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