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X-Ray Anomalous Scattering Study of a Charge-Ordered State in NaV2O3



Shin-ichi Nakao, K Ohwada, N Takesue, Y Fujiii, M Isobe, Y Ueda, M V. Zimmermann, J P. Hill, D Gibbs, Joseph Woicik, L Koyama, Y Murakami


Charge ordering of V4+ and V5+ in NaV2O5 has been studied by an X-ray diffraction technique using anomalous scattering near a vanadium K-aborption 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 x 2b x 4c, but not the chain-type originally proposed for the spin-Peierls state. Charge disproportionantion suggested in our model as the average valence V4.5 δc/2 is observed below , Tc showing continuous variation of δc as a function of temperature.
Physical Review Letters
No. 20


K-absorption, x-ray anomalous scattering, Zigzag-type


Nakao, S. , Ohwada, K. , Takesue, N. , Fujiii, Y. , Isobe, M. , Ueda, Y. , Zimmermann, M. , Hill, J. , Gibbs, D. , Woicik, J. , Koyama, L. and Murakami, Y. (2000), X-Ray Anomalous Scattering Study of a Charge-Ordered State in NaV<sub>2</sub>O<sub>3</sub>, Physical Review Letters (Accessed February 20, 2024)
Created November 12, 2000, Updated October 12, 2021