Abstract
The optical properties of sodium-deficient α′-Na x V2O5 (0.85 ≤ x ≤ 1.00) single crystals are analyzed using ellipsometry, and infrared reflectivity techniques. In sodium deficient samples, the optical absorption peak associated to the fundamental electronic gap develops in the middle of the pure α′-NaV2O5 gap at ∼0.44 eV, and the material remains insulating up to the maximal achieved hole concentration of about 15%. Nonmetallic behavior under hole doping provoked reinterpretation of the α′-NaV2O5 optical spectra. We argue that the absorption peak at about 0.9 eV corresponds to the photoionization energy of a large polaron.
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Konstantinović, M.J., Popović, Z.V., Presura, C. et al. Optical Properties, Electronic Structure and Magnetism of α′-Na x V2O5 . Journal of Superconductivity 15, 495–498 (2002). https://doi.org/10.1023/A:1021027826376
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DOI: https://doi.org/10.1023/A:1021027826376