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

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

2000-05-31

arxiv.org/abs/cond-mat/0005536v1

Phys. Rev. B 62, 16522 (2000)

Physics

Condensed Matter

Strongly Correlated Electrons

6 pages, ReVTeX, 5 figures in encapsulated postscript format

Scientific paper

10.1103/PhysRevB.62.16522

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.

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