Open AccessJournal Article
Optical properties of α'-NaxV2O5
M. J. Konstantinović,Zoran B. Popović,Victor Moshchalkov,C Presura,Radoš Gajić,M. Isobe,Y. Ueda +6 more
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TL;DR: The optical properties of sodium-deficient α'-Na V 2 O 5 (0.85≤x≤1.00) single crystals are analyzed in the wide energy range, from 0.012 to 4.5 eV, using ellipsometry, infrared reflectivity, and Raman-scattering techniques as discussed by the authors.
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Abstract: The optical properties of sodium-deficient α'-Na x V 2 O 5 (0.85≤x≤1.00) single crystals are analyzed in the wide energy range, from 0.012 to 4.5 eV, using ellipsometry, infrared reflectivity, and Raman-scattering techniques. The material remains insulating up to the maximal achieved hole concentration of about 15%. In sodium-deficient samples the optical absorption peak associated to the fundamental electronic gap develops at ∼0.44 eV. It corresponds to the transition between vanadium d x y and the impurity band, which forms in the middle of the pure α'-NaV 2 O 5 gap. Raman spectra measured with incident photon energy larger than 2 eV show strong resonant behavior, due to the presence of the hole-doping activated optical transitions, peaked at ∼2.8 eV.
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Citations
Magnetic gap in Slater insulator α′-NaV2O5
TL;DR: In this paper, the electronic structure of room-temperature (RT) phase α'-NaV2O5 has been investigated by fully selfconsistent first-principles calculations based on density functional theory (DFT).
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Optical properties, electronic structure and magnetism of alpha '-NaxV2O5
TL;DR: In this paper, the optical properties of sodium-deficient alpha-NaxV2O5 (0.85 less than or equal to x less than and equal to 1.00) single crystals were analyzed using ellipsometry, and infrared reflectivity techniques.
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Raman scattering study of charge ordering in β-Ca0.33V2O5
TL;DR: In this article, it was shown that in the mixed-valence state of β-Ca 0.33V2O5 the electrons are delocalized into V1 − O5 − V3 orbitals.
Raman scattering study of β-Sr(0.33)V(2)O(5) in charge disordered and ordered phase.
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