Reconstruction of the Electron–Phonon Interaction Function for Superconductors Using Inhomogeneous Point-Contacts and Correction Background in Yanson Spectra

The application of inhomogeneous niobium point-contacts in the superconducting state for reconstructing the electron–phonon interaction function is considered. The method is based on the use of the nonlinearity of current–voltage curve, which is due to the inelastic processes of suppressing excess point-contact current when nonequilibrium phonons are scattered from the electrons undergoing Andreev reflection. A new model of background occurrence in point-contact Yanson spectra and some ways to correct this background are proposed.