title: Crossover from coherent to incoherent electronic excitations in the normal state of Bi(2)Sr(2)CaCu(2)O(8+delta).
abstract: Angle resolved photoemission spectroscopy (ARPES) and resistivity measurements are used to explore the overdoped region of the high temperature superconductor Bi(2)Sr(2)CaCu(2)O(8+delta). We find evidence for a new crossover line in the phase diagram between a coherent metal phase, for lower temperatures and higher doping, and an incoherent metal phase, for higher temperatures and lower doping. The former is characterized by two well-defined spectral peaks in ARPES due to coherent bilayer splitting and superlinear behavior in the resistivity, whereas the latter is characterized by a single broad spectral feature in ARPES and a linear temperature dependence of the resistivity.
authors.affiliation: Department of Physics, University of Illinois at Chicago, Chicago, Illinois 60607, USA.
authors.forename: A
authors.initials: A
authors.lastname: Kaminski
authors.forename: S
authors.initials: S
authors.lastname: Rosenkranz
authors.forename: H M
authors.initials: HM
authors.lastname: Fretwell
authors.forename: Z Z
authors.initials: ZZ
authors.lastname: Li
authors.forename: H
authors.initials: H
authors.lastname: Raffy
authors.forename: M
authors.initials: M
authors.lastname: Randeria
authors.forename: M R
authors.initials: MR
authors.lastname: Norman
authors.forename: J C
authors.initials: JC
authors.lastname: Campuzano