Charge ordering and optical transitions of LiV2O5 and NaV2O5 - art. no. 121102

We present measurements of the polarized optical spectra of NaV2O5 and LiV2 O5 In an energy range from 0.5 to 5.5 eV, we observe similar peaks in the E parallel toa spectra of NaV2O5 and LiV2O5, which suggests similar electron ic structures along the a axis in both materials. On the other hand, we fin d an almost complete suppression of the peaks in sigma (b) of LiV2O5 around 1 and 5 eV. We attribute this suppression to the charge localization effec t originating from the existence of a double-chain charge-ordering pattern in LiV2O5.