title: Pronounced in-plane anisotropy of phonon anomalies in YBa(2)Cu(3)O(6.6).
abstract: The dispersion of the Cu-O bond-stretching and bond-bending vibrations in YBa(2)Cu(3)O(6.6) has been studied by high resolution inelastic neutron scattering. While the behavior of the bond-bending vibrations can be well accounted for by a simple potential model, the bond-stretching vibrations show a highly anomalous behavior. The displacement pattern of the most anomalous phonons is in principle consistent with dynamic charge stripe formation. However, charge stripes would have to extend along the a axis and not the b axis as inferred from the magnetic fluctuations by Mook et al. [Nature (London) 404, 729 (2000)].
authors.affiliation: Forschungszentrum Karlsruhe, Institut für Festkörperphysik, P.O.B. 3640, D-76021 Karlsruhe, Germany.
authors.forename: L
authors.initials: L
authors.lastname: Pintschovius
authors.forename: W
authors.initials: W
authors.lastname: Reichardt
authors.forename: M
authors.initials: M
authors.lastname: Kläser
authors.forename: T
authors.initials: T
authors.lastname: Wolf
authors.forename: H
authors.initials: H
authors.lastname: v  Löhneysen