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Charge ordering and optical transitions of LiV2O5 and NaV2O5

By M. J. Konstantinović, J. Dong, M. E. Ziaei, B. P. Clayman, J. C. Irwin, M. Isobe and Y. Ueda


We present the measurements of the polarized optical spectra of NaV2O5 and LiV2O5. In the energy range from 0.5 to 5.5 eV we observe similar peaks in the E ‖ a spectra of NaV2O5 and LiV2O5, which suggests similar electronic structure along the a axis in both materials. On the other hand, we find almost complete suppression of the peaks in σb of LiV2O5 around 1 and 5 eV. We attribute this suppression to the charge localization effect originating from the existence of double chain charge ordering pattern in LiV2O5. PACS: 78.40.-q, 71.35.-y, 75.50.-y In the past several years, quantum phenomena resulting from the low- dimensionality of the effective electron interactions in solids have been investigated with increasing intensity from both experimental and theoretical points of view. Such an increase of interest is partially motivated by the discovery of inorganic materials which exhibit quantum effects, such as Sr −Cu −O system 1 or CuGeO3 2, and by a common belief that these studies would give us a better understanding of electron correlations in general

Year: 2000
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