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Raman scattering study of charge ordering in beta-Ca0.33V2O5 | | Z.V.Popovic
; M.J.Konstantinovic
; V.V.Moshchalkov
; M.Isobe
; Y.Ueda
; | | Date: |
24 Dec 2002 | | Subject: | Strongly Correlated Electrons | cond-mat.str-el | | Abstract: | Polarized Raman spectra of the calcium vanadium oxide bronze beta-Ca0.33V2O5 are measured in the temperature range between 300 K and 20 K. The charge ordering phase transition at about 150 K is characterized by the appearance of the new Raman-active modes in the spectra, and by anomalies in the electronic background scattering. The high temperature Raman scattering spectra of beta-Ca0.33V2O5 are in apparent resemblance with those of alpha’-NaV2O5, which suggests that there is a similar charge-phonon dynamics in both compounds. The study of dynamical properties and the symmetry analysis of the Raman modes show that in the mixed valence state of beta-Ca0.33V2O5 the electrons are delocalized into V1-O5-V3 orbitals. We propose that in the charge ordered state below 150 K the d-electrons localize within V1-V3 ladders, either in "zig-zag" fashion like in alpha’-NaV2O5 or in the forms of the double chains like in gamma-LiV2O5. | | Source: | arXiv, cond-mat/0301477 | | Services: | Forum | Review | PDF | Favorites | |
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