Low temperature ellipsometry of NaV2O5

Details Low temperature ellipsometry of NaV2O5 Low temperature ellipsometry of NaV2O5

1999-11-28

arxiv.org/abs/cond-mat/9911451v2

Phys. Rev. B 61, 15762 (2000)

Physics

Condensed Matter

Strongly Correlated Electrons

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

Scientific paper

10.1103/PhysRevB.61.15762

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.

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