X-ray anomalous scattering study of a charge-ordered state in NaV2O5

被引：60

作者：

Nakao, H ^{[5
]}

Ohwada, K

Takesue, N

Fujii, Y

Isobe, M

Ueda, Y

Von Zimmermann, M

Hill, JP

Gibbs, D

Woicik, JC

Koyama, I

Murakami, Y

机构：

[1] Univ Tokyo, Inst Solid State Phys, Neutron Scattering Lab, Tokai, Ibaraki 3191106, Japan

[2] Univ Tokyo, Inst Solid State Phys, Mat Design & Characterizat Lab, Minato Ku, Tokyo 1068666, Japan

[3] Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA

[4] Natl Inst Stand & Technol, Gaithersburg, MD 20899 USA

[5] High Energy Accelerator Res Org KEK, Inst Mat Struct Sci, Photon Factory, Tsukuba, Ibaraki 3050801, Japan

来源：

PHYSICAL REVIEW LETTERS | 2000年 / 85卷 / 20期

关键词：

D O I：

10.1103/PhysRevLett.85.4349

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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 T-C = 35 K. The charge ordering pattern is the fully charged zigzag-type ladder with the unit cell 2a X 2b X 4c, but not the chain-type originally proposed for the spin-Peierls state. Charge disproportionation suggested in our model as the average valence V4.5+/-deltac/2 is observed below T-C, showing continuous variation of delta (c) as a function of temperature.

引用

页码：4349 / 4352

页数：4

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