title: Fermi surface and quasiparticle excitations of overdoped Tl2Ba2CuO6 + delta.
abstract: The high-T(c) superconductor Tl(2)Ba(2)CuO(6 + delta) is studied by angle-resolved photoemission spectroscopy. For a very overdoped T(c) = 30 K sample, the Fermi surface consists of a single large hole pocket centered at (pi, pi) and is approaching a topological transition. Although a superconducting gap with d(x(2)-y(2)) symmetry is tentatively identified, the quasiparticle evolution with momentum and binding energy exhibits a marked departure from the behavior observed in under and optimally doped cuprates. The relevance of these findings to scattering, many-body, and quantum-critical phenomena is discussed.
authors.affiliation: Department of Physics and Astronomy, University of British Columbia, Vancouver, Canada.
authors.forename: M
authors.initials: M
authors.lastname: Platé
authors.forename: J D F
authors.initials: JD
authors.lastname: Mottershead
authors.forename: I S
authors.initials: IS
authors.lastname: Elfimov
authors.forename: D C
authors.initials: DC
authors.lastname: Peets
authors.forename: Ruixing
authors.initials: R
authors.lastname: Liang
authors.forename: D A
authors.initials: DA
authors.lastname: Bonn
authors.forename: W N
authors.initials: WN
authors.lastname: Hardy
authors.forename: S
authors.initials: S
authors.lastname: Chiuzbaian
authors.forename: M
authors.initials: M
authors.lastname: Falub
authors.forename: M
authors.initials: M
authors.lastname: Shi
authors.forename: L
authors.initials: L
authors.lastname: Patthey
authors.forename: A
authors.initials: A
authors.lastname: Damascelli