Optical properties and electronic structure of Ca-doped alpha'-NaV2O5

The dielectric function of alpha'-Na(1-x)Ca(x)V2O5 (0 < x < 20%) was measured for the a and b axes in the photon energy range 0.8-4.5 eV at room temperature. By varying the Ca-concentration we control the relative abundancy of V4+ and V5+. We observe that the intensity of the main optical...

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Bibliographic Details
Published inarXiv.org
Main Authors Presura, C, van der Marel, D, Dischner, M, Geibel, C, Kremer, R K
Format Paper
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 31.05.2000
Subjects
Dielectric properties
Electronic structure
Optical properties
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Summary:The dielectric function of alpha'-Na(1-x)Ca(x)V2O5 (0 < x < 20%) was measured for the a and b axes in the photon energy range 0.8-4.5 eV at room temperature. By varying the Ca-concentration we control the relative abundancy of V4+ and V5+. We observe that the intensity of the main optical absorption peak at 1 eV is proportional to the number of V5+ ions. This rules out the interpretation as a V4+ d-d excitation, and it establishes that this is the on-rung bonding-antibonding transition.
ISSN:2331-8422
DOI:10.48550/arxiv.0005536