Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2002-03-14
Physics
Condensed Matter
Strongly Correlated Electrons
7 pages, 4 fugures, to be published in PRB
Scientific paper
10.1103/PhysRevB.65.245103
The optical properties of sodium-deficient NaxV2O5 (0.85 < x <1) 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 about 0.44 eV. It corresponds to the transition between vanadium dxy and the impurity band, which forms in the middle of the pure NaV2O5 gap. Raman spectra measured with incident photon energy larger then 2 eV show strong resonant behavior, due to the presence of the hole-doping activated optical transitions, peaked at 2.8 eV.
Gajic Radoš
Isobe Masaharu
Konstantinovic Milan J.
Moshchalkov Victor V.
Popovic Z. V.
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