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Renormalization of spectral line shape and dispersion below Tc in Bi2Sr2CaCu2O8+delta
A Kaminski1, M Randeria, J C Campuzano
1Department of Physics, University of Illinois at Chicago, 60607, USA.
Physical Review Letters
|February 15, 2001
Abstract:
Angle-resolved photoemission data in the superconducting state of Bi2Sr2CaCu2O8+delta 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 (pi,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.