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We have studied the electronic properties of the ladder compound$\alpha'$-NaV$_{2}$O$_{5}$, adopting a joint experimental and theoreticalapproach. The momentum-dependent loss function was measured using electronenergy-loss spectroscopy in transmission. The optical conductivity derived fromthe loss function by a Kramers-Kronig analysis agrees well with our resultsfrom LSDA+U band-structure calculations upon application of anantiferromagnetic alignment of the V~3$d_{xy}$ spins along the legs and anon-site Coulomb interaction U of between 2 and 3 eV. The decomposition of thecalculated optical conductivity into contributions from transitions betweenselected energy regions of the DOS reveals the origin of the observedanisotropy of the optical conductivity. In addition, we have investigated theplasmon excitations related to transitions between the vanadium states withinan effective 16 site vanadium cluster model. Good agreement between thetheoretical and experimental loss function was obtained using the hoppingparameters derived from the tight binding fit to the band-structure andmoderate Coulomb interactions between the electrons within the ab plane.Comment: 23 pages, 8 figures; submitted to PR

physical review. b, condensed matter

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One-dimensional dynamics of thedelectrons inα′−NaV2O<…