Renormalization of spectral line shape and dispersion below Tc in Bi2Sr2CaCu2O8+delta.
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.
Kaminski
A
A
Department of Physics, University of Illinois at Chicago, 60607, USA.
Randeria
M
M
Campuzano
J C
JC
Norman
M R
MR
Fretwell
H
H
Mesot
J
J
Sato
T
T
Takahashi
T
T
Kadowaki
K
K