INFLUENCE OF LIFETIME BROADENING IN THE DETERMINATION OF THE ELIASHBERG FUNCTION FROM BREAK-JUNCTION TUNNELING DATA IN BI2SR2CACU2O8-CRYSTALS(X SINGLE)

The electron density of states obtained from break-junction tunneling experiments in Bi2Sr2CaCu2O8+x Single crystals and well described by t he lifetime broadening model has been subjected to an unfolding proced ure for removing the effects of the extrinsic broadening The resulting density exhibits large phonon-like anomalies at energies greater than the gap, The electron-phonon spectral function alpha(2)(omega)F(omega ), determined by solving the Eliashberg equations, indicates a very st rong electron-phonon interaction, possibly in the ab plane and with so me selected phonon modes, and reveals the important role played by thi s interaction in the pairing mechanism.