title: Two-component dynamics of the order parameter of high temperature Bi2Sr2CaCu2O8+delta superconductors revealed by time-resolved Raman scattering.
abstract: We study the dynamics of the superconducting order parameter in the high-Tc cuprate Bi2Sr2CaCu2O8+delta by employing a novel time-resolved pump-probe Raman experiment. We find two different coupling mechanisms that contribute equally to the pair-breaking peak. One coupling sets in very fast at 2 ps and relaxes slowly, while the other one is delayed and sets in roughly at 5 ps and relaxes fast. A model that couples holes through phonons is able to reproduce one part of the condensate dynamics; thus, we argue that hole-spin interactions are of importance as well.
authors.affiliation: Institut für Angewandte Physik, Universität Hamburg, Jungiusstrasse 11, D-20355 Hamburg, Germany.
authors.forename: R P
authors.initials: RP
authors.lastname: Saichu
authors.forename: I
authors.initials: I
authors.lastname: Mahns
authors.forename: A
authors.initials: A
authors.lastname: Goos
authors.forename: S
authors.initials: S
authors.lastname: Binder
authors.forename: P
authors.initials: P
authors.lastname: May
authors.forename: S G
authors.initials: SG
authors.lastname: Singer
authors.forename: B
authors.initials: B
authors.lastname: Schulz
authors.forename: A
authors.initials: A
authors.lastname: Rusydi
authors.forename: J
authors.initials: J
authors.lastname: Unterhinninghofen
authors.forename: D
authors.initials: D
authors.lastname: Manske
authors.forename: P
authors.initials: P
authors.lastname: Guptasarma
authors.forename: M S
authors.initials: MS
authors.lastname: Williamsen
authors.forename: M
authors.initials: M
authors.lastname: Rübhausen