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

Published

November 13, 2000

Author(s)

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

Abstract

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 V^{4.5 δc/2} is observed below , Tc showing continuous variation of δ_c as a function of temperature.

Citation

Physical Review Letters

Volume

85

Issue

No. 20

Pub Type

Journals

Keywords

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

Citation

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 NaV₂O₃, Physical Review Letters (Accessed June 18, 2024)