X-ray Anomalous Scattering Study of a Charge-Ordered State in NaV2O5

Details X-ray Anomalous Scattering Study of a Charge-Ordered State in NaV2O5 X-ray Anomalous Scattering Study of a Charge-Ordered State in NaV2O5

2000-03-08

arxiv.org/abs/cond-mat/0003129v3

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.85.4349

Charge ordering of V4+ and V5+ in NaV2O5 has been studied by an X-ray diffraction technique using anomalous scattering near a vanadium K-absorption edge to critically enhance a contrast between the two ions. A dramatic energy dependence of the superlattice intensities is observed below Tc=35 K. Consequently, the charge ordering pattern is the zigzag-type ladders with the unit cell 2a*2b*4c, but not the chain-type originally proposed for the spin-Peierls state. Charge disproportionation suggested in our model as the average valence V^{4.5+-delta_c/2} is observed below T_C, showing continuous variation of delta_c as a function of temperature.

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