Kinks, nodal bilayer splitting, and interband scattering in YBa2Cu3O(6+x).
We apply the new-generation angle-resolved photoemission spectroscopy methodology to the most widely studied cuprate superconductor YBa2Cu3O(6+x). Considering the nodal direction, we found noticeable renormalization effects known as kinks both in the quasiparticle dispersion and scattering rate, the bilayer splitting, and evidence for strong interband scattering--all the characteristic features of the nodal quasiparticles detected earlier in Bi2Sr2CaCu2O(8+delta). The typical energy scale and the doping dependence of the kinks clearly point to their intimate relation with the spin-1 resonance seen in the neutron scattering experiments. Our findings strongly suggest a universality of the electron dynamics in the bilayer superconducting cuprates and a dominating role of the spin fluctuations in the formation of the quasiparticles along the nodal direction.
Borisenko
S V
SV
IFW Dresden, P.O. Box 270116, D-01171 Dresden, Germany.
Kordyuk
A A
AA
Zabolotnyy
V
V
Geck
J
J
Inosov
D
D
Koitzsch
A
A
Fink
J
J
Knupfer
M
M
Büchner
B
B
Hinkov
V
V
Lin
C T
CT
Keimer
B
B
Wolf
T
T
Chiuzbăian
S G
SG
Patthey
L
L
Follath
R
R