Investigation Of The Energy-Gap And Phonon Structure In Tunneling Junctions Of The Bi2sr2cacu2o8 Single-Crystal Cleavages

Tunneling junctions of the point-contact type of Bi2Sr2CaCu2O8 single crystals have been studied, a natural oxide of aluminium electrode serving as a tunneling barrier. The ratio 2-DELTA/kT(c) = 5-6 was obtained in this investigation. A phenomenological model was applied for describing the behaviour of tunneling characteristics. From the numerical calculations and on the basis of this model, the phonon singularities in tunneling characteristics were treated by the standard program for the solutions of the Eliashberg equations and the electron-phonon interaction function, alpha-2(omega)F(omega), was found.