2002/03/14 by M. J. Konstantinovic, M.J. Konstantinović, Z. V. Popovic +9
Chemistry · Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Analytical Chemistry (journal) #Band gap #Chemistry #Doping #Electronic and Structural Properties of Oxides #Materials science #Optics #Optoelectronics #Physics #Raman spectroscopy #Transition Metal Oxide Nanomaterials #Vanadium #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.65.245103
7 pages, 4 fugures, to be published in PRB
arxiv created 2002/03/14 · openalex publication_date 2002/05/28 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
The optical properties of sodium-deficient \ensuremathα^\ensuremath'\ensuremath-NaxV2O5 (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 \ensuremath∼0.44 eV. It corresponds to the transition between vanadium dxy and the impurity band, which forms in the middle of the pure \ensuremathα^\ensuremath'\ensuremath-NaV2O5 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 \ensuremath∼2.8 eV.