title: Competition between the Pseudogap and superconducting states of Bi2Sr2Ca0.92Y0.08Cu2O8+δ single crystals revealed by ultrafast broadband optical reflectivity.
abstract: Ultrafast broadband transient reflectivity experiments are performed to study the interplay between the nonequilibrium dynamics of the pseudogap and the superconducting phases in Bi(2)Sr(2}Ca(0.92)Y(0.08)Cu(2)O(8+δ). Once superconductivity is established, the relaxation of the pseudogap proceeds ~2 times faster than in the normal state, and the corresponding transient reflectivity variation changes sign after ~0.5 ps. The results can be described by a set of coupled differential equations for the pseudogap and for the superconducting order parameter. The sign and strength of the coupling term suggest a remarkably weak competition between the two phases, allowing their coexistence.
authors.affiliation: Department of Physics, Università degli Studi di Trieste, Trieste I-34127, Italy.
authors.forename: G
authors.initials: G
authors.lastname: Coslovich
authors.forename: C
authors.initials: C
authors.lastname: Giannetti
authors.forename: F
authors.initials: F
authors.lastname: Cilento
authors.forename: S
authors.initials: S
authors.lastname: Dal Conte
authors.forename: T
authors.initials: T
authors.lastname: Abebaw
authors.forename: D
authors.initials: D
authors.lastname: Bossini
authors.forename: G
authors.initials: G
authors.lastname: Ferrini
authors.forename: H
authors.initials: H
authors.lastname: Eisaki
authors.forename: M
authors.initials: M
authors.lastname: Greven
authors.forename: A
authors.initials: A
authors.lastname: Damascelli
authors.forename: F
authors.initials: F
authors.lastname: Parmigiani