Abstract
The electron density of states obtained from break-junction tunneling experiments in Bi 2Sr 2CaCu 2O 8+x single crystals and well described by the lifetime broadening model has been subjected to an unfolding procedure 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 α 2 (ω) F (ω), determined by solving the Eliashberg equations, indicates a very strong electron-phonon interaction, possibly in the ab plane and with some selected phonon modes, and reveals the important role played by this interaction in the pairing mechanism.
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