A new preprint on arXiv today analyzes the low-energy kink in the dispersion curve on Bi-2212 high-Tc superconductor. They concluded that this low energy kink (smaller than the gap) is due to an in-plane acousting phonon branch.
So this adds more intrigue to the picture. The cuprate superconductors seems to have a lot of "kinks" in the band structure. Last count, we now have 3. To catch up on all the issues surrounding this, read my first entry on the kink structure that we have seen from ARPES measurement. That entry will be continually updated as more papers and new stuff are published.
Zz.
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