TUNNELING SPECTROSCOPY OF BI2SR2CACU2O8 SINGLE-CRYSTALS

The tunneling spectra on Bi2Sr2CaCu2O8 Single crystals have been inves tigated in magnetic fields up to 20 T by using the break-junction tech nique. The second derivatives d(2)I/dV(2)(V) exhibited additional symm etrical structures at voltages above the energy gap. These structures were broadened in magnetic fields together with the gap structure, but remained at 20 T. The data were inverted by using the Rowell-McMillan program in order to obtain the alpha(2)F(omega) function for the elec tron-phonon interaction. The main features of alpha(2)F(omega) are wel l reproduced for different samples and can be reasonably compared with the phonon density of states obtained by inelastic neutron scattering .