Dependence of band-renormalization effects on the number of copper oxide layers in Tl-based copper oxide superconductors revealed by angle-resolved photoemission spectroscopy.
Here we report the first angle-resolved photoemission measurement on nearly optimally doped multilayer Tl-based superconducting cuprates (Tl-2212 and Tl-1223) and a comparison study to single-layer (Tl-2201) compound. A "kink" in the band dispersion is found in all three compounds but exhibits different momentum dependence for the single-layer and multilayer compounds, reminiscent to that of Bi-based cuprates. This layer number dependent renormalization effect strongly implies that the spin-resonance mode is unlikely to be responsible for the dramatic renormalization effect near the antinodal region.
Lee
W S
WS
SIMES, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA.
Tanaka
K
K
Vishik
I M
IM
Lu
D H
DH
Moore
R G
RG
Eisaki
H
H
Iyo
A
A
Devereaux
T P
TP
Shen
Z X
ZX