Low temperature ellipsometry of NaV2O5

Abstract

The dielectric function of alpha'NaV2O5 was measured with electric field along the a and b axes in the photon energy range 0.8-4.5 eV for temperatures down to 4K. We observe a pronounced decrease of the intensity of the 1 eV peak upon increasing temperature with an activation energy of about 25meV, indicating that a finite fraction of the rungs becomes occupied with two electrons while others are emptied as temperature increases. No appreciable shifts of peaks were found s in the valence state of individual V atoms at the phase transition is very small. A remarkable inflection of this temperature dependence at the phase transition at 34 K indicates that charge ordering is associated with the low temperature phase.

Revisions in style and order of presentation. One new figure. In press in Physical Review B. REVTeX, 4 pages with 4 postscript figures

References in corpus (3)

• Response: Spin-Singlet clusters in the ladder compound NaV2O5
• Optical spectroscopic study of the interplay of spin and charge in NaV2O5
• Theoretical study of the optical conductivity of ${\alpha }^{\prime }-Na{V}_2{O}_5$

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