title: Dispersion of magnetic excitations in the cuprate La2CuO4 and CaCuO2 compounds measured using resonant x-ray scattering.
abstract: By resonant inelastic x-ray scattering in the soft x-ray regime we probe the dynamical multiple-spin correlations in the antiferromagnetic cuprates La2CuO4 and CaCuO2. High resolution measurements at the copper L3 edge allow the clear observation of dispersing bimagnon excitations. Theory based on the ultrashort core-hole lifetime expansion fits the data on these coherent spin excitations without free parameters.
authors.affiliation: CNR-INFM Coherentia and Soft, Dipartimento di Fisica, Politecnico di Milano, I-20133 Milano, Italy.
authors.forename: L
authors.initials: L
authors.lastname: Braicovich
authors.forename: L J P
authors.initials: LJ
authors.lastname: Ament
authors.forename: V
authors.initials: V
authors.lastname: Bisogni
authors.forename: F
authors.initials: F
authors.lastname: Forte
authors.forename: C
authors.initials: C
authors.lastname: Aruta
authors.forename: G
authors.initials: G
authors.lastname: Balestrino
authors.forename: N B
authors.initials: NB
authors.lastname: Brookes
authors.forename: G M
authors.initials: GM
authors.lastname: De Luca
authors.forename: P G
authors.initials: PG
authors.lastname: Medaglia
authors.forename: F Miletto
authors.initials: FM
authors.lastname: Granozio
authors.forename: M
authors.initials: M
authors.lastname: Radovic
authors.forename: M
authors.initials: M
authors.lastname: Salluzzo
authors.forename: J
authors.initials: J
authors.lastname: van den Brink
authors.forename: G
authors.initials: G
authors.lastname: Ghiringhelli