Point-contact spectroscopy of the electron–phonon interaction in polyvalent nontransition metals: indium and thallium

The electron–phonon interaction in indium and thallium is investigated experimentally by the point-contact spectroscopy method. The point-contact functions of the electron–phonon interaction are determined from the measured variations of the second derivatives of the point-contact current–voltage characteristics as a function of the voltage. The results are compared with the Éliashberg electron–phonon interaction functions and the densities of phonon states. The variations of the relative intensity and the positions of the maxima of the point-contact spectra of thallium are interpreted as the onset of a possible anisotropy of the electron–phonon interaction in this metal. Two-phonon electron-scattering processes in thallium point contacts are investigated.

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