Another preprint appears today on the origin of the "kink" that in ARPES spectra of high-Tc superconductors. This time, there is a careful analysis of the role of phonons in producing such an effect[1]. By making the assumption that the magnetic effects play no role at all, they calculated the possible outcome of the phonon mode as the sole source of the band kink. They concluded that for optimally-doped Bi2212, phonons contribute only 10% to this effect.
So from this work, phonons are not the dominant factor in causing the kink.
I have updated the original blog entry to contain this reference.
Zz.
[1] http://arxiv.org/abs/0906.2627
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