Anomalous momentum dependence of the quasiparticle scattering rate in overdoped Bi2Sr2CaCu2O8.
The question of the anisotropy of the electron scattering in high temperature superconductors is investigated using high resolution angle-resolved photoemission data from Pb-doped Bi2Sr2CaCu2O8 (Bi2212) with suppressed superstructure. The scattering rate of low energy electrons along two bilayer-split pieces of the Fermi surface is measured (via the quasiparticle peak width), and no increase of scattering towards the antinode (pi,0) region is observed, contradicting the expectation from Q=(pi,pi) scattering. The results put a limit on the effects of Q=(pi,pi) scattering on the electronic structure of this overdoped superconductor with still very high T(c).
Bogdanov
P V
PV
Department of Physics, Applied Physics and Stanford Synchrotron Radiation Laboratory, Stanford University, California 94305, USA.
Lanzara
A
A
Zhou
X J
XJ
Yang
W L
WL
Eisaki
H
H
Hussain
Z
Z
Shen
Z X
ZX