title: Anomalous dispersion of longitudinal optical phonons in Nd(1.86)Ce(0.14)CuO(4+delta) determined by inelastic x-ray scattering.
abstract: The phonon dispersions of Nd(1.86)Ce(0.14)CuO(4+delta) along the [xi,0,0] direction have been determined by inelastic x-ray scattering. Compared to the undoped parent compound, the two highest longitudinal phonon branches, associated with the Cu-O bond stretching and out-of-plane oxygen vibration, are shifted to lower energies. Moreover, an anomalous softening of the bond-stretching band is observed at about q = (0.2,0,0). These signatures provide evidence for strong electron-phonon coupling in this electron-doped high-temperature superconductor.
authors.affiliation: European Synchrotron Radiation Facility, BP 220, F-38043 Grenoble Cedex, France.
authors.forename: M
authors.initials: M
authors.lastname: d'Astuto
authors.forename: P K
authors.initials: PK
authors.lastname: Mang
authors.forename: P
authors.initials: P
authors.lastname: Giura
authors.forename: A
authors.initials: A
authors.lastname: Shukla
authors.forename: P
authors.initials: P
authors.lastname: Ghigna
authors.forename: A
authors.initials: A
authors.lastname: Mirone
authors.forename: M
authors.initials: M
authors.lastname: Braden
authors.forename: M
authors.initials: M
authors.lastname: Greven
authors.forename: M
authors.initials: M
authors.lastname: Krisch
authors.forename: F
authors.initials: F
authors.lastname: Sette