Abstract
Angle-resolved photoemission data in the superconducting state of
Bi2Sr2CaCu2O8+δ show a kink in the dispersion along the zone diagonal,
which is related via a Kramers-Krönig analysis to a drop in the low
energy scattering rate. As one moves towards (π,0), this kink evolves
into a spectral dip. The occurrence of these anomalies in the dispersion
and line shape throughout the zone indicates the presence of a new
energy scale in the superconducting state.
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