title: Anomalous momentum dependence of the quasiparticle scattering rate in overdoped Bi2Sr2CaCu2O8.
abstract: 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).
authors.affiliation: Department of Physics, Applied Physics and Stanford Synchrotron Radiation Laboratory, Stanford University, California 94305, USA.
authors.forename: P V
authors.initials: PV
authors.lastname: Bogdanov
authors.forename: A
authors.initials: A
authors.lastname: Lanzara
authors.forename: X J
authors.initials: XJ
authors.lastname: Zhou
authors.forename: W L
authors.initials: WL
authors.lastname: Yang
authors.forename: H
authors.initials: H
authors.lastname: Eisaki
authors.forename: Z
authors.initials: Z
authors.lastname: Hussain
authors.forename: Z X
authors.initials: ZX
authors.lastname: Shen