title: Quasiparticlelike peaks, kinks, and electron-phonon coupling at the (pi,0) regions in the CMR oxide La2-2x Sr1+2x Mn2 O7.
abstract: Using angle-resolved photoemission, we have observed sharp quasiparticlelike peaks in the prototypical layered manganite La(2-2x)Sr(1+2x)Mn(2)O(7) (x=0.36,0.38). We focus on the (pi,0) regions of k space and study their electronic scattering rates and dispersion kinks, uncovering bilayer-split bands, the critical energy scales, momentum scales, and strengths of the interactions that renormalize the electrons. To identify these bosons, we measured phonon dispersions in the energy range of the kink by inelastic neutron scattering, finding a good match in both energy and momentum to the oxygen bond-stretching phonons.
authors.affiliation: Department of Physics, University of Colorado, Boulder, CO 80309, USA.
authors.forename: Z
authors.initials: Z
authors.lastname: Sun
authors.forename: Y-D
authors.initials: YD
authors.lastname: Chuang
authors.forename: A V
authors.initials: AV
authors.lastname: Fedorov
authors.forename: J F
authors.initials: JF
authors.lastname: Douglas
authors.forename: D
authors.initials: D
authors.lastname: Reznik
authors.forename: F
authors.initials: F
authors.lastname: Weber
authors.forename: N
authors.initials: N
authors.lastname: Aliouane
authors.forename: D N
authors.initials: DN
authors.lastname: Argyriou
authors.forename: H
authors.initials: H
authors.lastname: Zheng
authors.forename: J F
authors.initials: JF
authors.lastname: Mitchell
authors.forename: T
authors.initials: T
authors.lastname: Kimura
authors.forename: Y
authors.initials: Y
authors.lastname: Tokura
authors.forename: A
authors.initials: A
authors.lastname: Revcolevschi
authors.forename: D S
authors.initials: DS
authors.lastname: Dessau