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

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-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.

arXiv comment4 pages, 4 figures

References in corpus (8)

• NaV_2O_5 as a quarter-filled ladder compound
• Experimental evidence for a spin-Peierls-transition in ${\alpha }^{\prime }-Na{V}_2{O}_5$
• A new view of the electronic structure of the spin-Peierls compound alpha'-NaV2O5
• Charge ordering and spin- Peierls transition in alpha'-NaV2O5
• Coexistence of charge density wave and spin-Peierls orders in quarter-filled quasi-one dimensional correlated electron systems
• Magnon splitting induced by charge ordering in NaV_2O_5
• Response: Spin-Singlet clusters in the ladder compound NaV2O5
• Charge Order Driven spin-Peierls Transition in NaV2O5

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• Resonant X-ray Scattering in Manganites - Study of Orbital Degree of Freedom -
• Low-Temperature Structure of the Quarter-Filled Ladder Compound alpha'-NaV2O5
• X-ray anomalous scattering investigations on the charge order in ${\alpha }^{\prime }$-NaV${}_2$O${}_5$
• Charge-Order Pattern of the Low-Temperature Phase of NaV2O5 Uniquely Determined by Resonant X-Ray Scattering from Monoclinic Single Domain
• Low energy excitations and dynamic Dzyaloshinskii-Moriya interaction in ${\alpha }^{\prime }$-NaV${}_2$O${}_5$ studied by far infrared spectroscopy
• Lattice vibrations of alpha'-NaV_2O_5 in the low-temperature phase. Magnetic bound states?
• Nature of insulating state in NaV${}_2$O${}_5$ above charge-ordering transition: a cluster DMFT study
• Orthorhombic versus monoclinic symmetry of the charge-ordered state of NaV2O5
• Optical properties, electron-phonon coupling, and Raman scattering of vanadium ladder compounds
• One-dimensional dynamics of the d-electrons in ${\alpha }^{\prime }$-NaV${}_2$O${}_5$
• Creation and destruction of a spin gap in weakly coupled quarter-filled ladders
• Using electronic structure changes to map the H-T phase diagram of alpha'-NaV2O5
• Exact diagonalisation study of charge order in the quarter-filled two-leg ladder system NaV2O5
• 4p states and X-Ray Spectroscopy