Published in
American Physical Society, Physical Review Letters, 16(102), 2009
DOI: 10.1103/physrevlett.102.167401
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Dispersion of Magnetic Excitations in the CuprateLa2CuO4andCaCuO2Compounds Measured Using Resonant X-Ray Scattering
Journal article published in 2009 by
L. Braicovich,
L. J. P. Ament,
V. Bisogni,
F. Forte,
C. Aruta 
,
G. Balestrino,
N. B. Brookes,
G. M. De Luca,
P. G. Medaglia,
F. Miletto Granozio,
M. Radovic,
M. Salluzzo,
J. van den Brink,
G. Ghiringhelli
,
G. Balestrino,
N. B. Brookes,
G. M. De Luca,
P. G. Medaglia,
F. Miletto Granozio,
M. Radovic,
M. Salluzzo,
J. van den Brink,
G. Ghiringhelli
This paper is available in a repository.
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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.