Charge ordering signatures in the optical properties of beta-Na0.33V2O5
Abstract
Temperature dependent optical spectra are reported for beta-Na0.33V2O5. The sodium ordering transition at TNa = 240 K, and in particular the charge ordering transition at TMI = 136 K strongly influence the optical spectra. The metal-insulator transition at leads to the opening of a psuedogap (ω= 1700 cm-1), and to the appearance of a large number of optical phonons. These observations, and the presence of a mid-infrared band (typical for low dimensional metals) strongly suggests that the charge carriers in beta-Na0.33V2O5 are small polarons.
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