Abstract
The dielectric function of α′-Na1-xCaxV2O5 (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. © 2000 The American Physical Society.
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CITATION STYLE
Presura, C., Van der Marel, D., Dischner, M., Geibel, C., & Kremer, R. K. (2000). Optical properties and electronic structure of α′-Na1-xCaxV2O5. Physical Review B - Condensed Matter and Materials Physics, 62(24), 16522–16527. https://doi.org/10.1103/PhysRevB.62.16522
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