Effect of Zn and Ni impurities on the quasiparticle renormalization of superconducting Bi-2212.
The Cu substitution by Zn and Ni impurities and its influence on the mass renormalization effects in angle-resolved photoelectron spectra (ARPES) of Bi2Sr2CaCu2O8-delta is addressed. We show that the nonmagnetic Zn atoms have a much stronger effect in both the nodal and antinodal parts of the Brillouin zone than magnetic Ni. The observed changes are consistent with the behavior of the spin resonance mode as seen by inelastic neutron scattering in YBCO. This strongly suggests that the "peak-dip-hump" and the kink in ARPES on the one side and neutron resonance on the other are closely related features.
Zabolotnyy
V B
VB
Institute for Solid State Research, IFW-Dresden, P.O. Box 270116, D-01171 Dresden, Germany.
Borisenko
S V
SV
Kordyuk
A A
AA
Fink
J
J
Geck
J
J
Koitzsch
A
A
Knupfer
M
M
Büchner
B
B
Berger
H
H
Erb
A
A
Lin
C T
CT
Keimer
B
B
Follath
R
R