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The study of bosonic modes that couple to the charge carriers is a keyelement in understanding superconductivity. Lee et al. have usedatomic-resolution scanning tunneling spectroscopy (STM) in an attempt toextract the spectrum of of these modes in the high temperature superconductorBi2Sr2CaCu2O8+d and they found a mode whose frequency did not depend on dopingbut changed on 16O to 18O isotopic substitution leading them to suggest a rolefor lattice modes (phonons). A careful examination of their published datareveals a weaker but distinct feature that has all the characteristics of themagnetic excitation identified as the bosonic mode in other competingexperiments. We suggest the lattice mode seen by Lee et al. is not relevant tosuperconductivity and is due to inelastic tunneling through the insulatingoxide layer.

Role of magnetism and electron-lattice interactions in STM spectra of cuprates