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We report the first measurement of the optical phonon dispersion in optimallydoped single layer Bi2Sr1.6La0.4Cu2O6+delta using inelastic x-ray scattering.We found a strong softening of the Cu-O bond stretching phonon at aboutq=(0.25,0,0) from 76 to 60 meV, similar to the one reported in other cuprates.A direct comparison with angle-resolved photoemission spectroscopy measurementstaken on the same sample, revealed an excellent agreement in terms of energyand momentum between the ARPES nodal kink and the soft part of the bondstretching phonon. Indeed, we find that the momentum space where a 63 meV kinkis observed can be connected with a vector q=(xi,0,0) with xi~0.22, whichcorresponds exactly to the soft part of the bond stretching phonon mode. Thisresult supports an interpretation of the ARPES kink in terms of electron-phononcoupling.

Bond stretching phonon softening and angle-resolved photoemission kinks in optimally doped Bi2Sr1.6La0.4Cu2O6 superconductors