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We have measured the near-normal incidence reflectivity of single crystals of the vanadium bronze Na0.33V2O5, in the range 0.9 μ-3.4μ. The reflectivity R∥ for light polarized along the b-axis exhibits a plasma edge, as in a metal, whereas the reflectivity R〉 for the perpendicular polarization is relatively featureless.
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Kaplan et al. (1976) studied this question.
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