Charge Ordering and Spin Dynamics in NaV2O5

Abstract

We report high-resolution neutron inelastic scattering experiments on the spin excitations of NaV2O5. Below Tc, two branches associated with distinct energy gaps are identified. From the dispersion and intensity of the spin excitation modes, we deduce the precise zig-zag charge distribution on the ladder rungs and the corresponding charge order (about 0.6). We argue that the spin gaps observed in the low-T phase of this compound are primarily due to the charge transfer.

4 pages, 5 figures, to appear in Phys. Rev. Lett

References in corpus (5)

• Elastic Constants and Charge Ordering in a'-NaV2O5
• Charge Order in NaV2O5 studied by EPR
• Can a frustrated spin-cluster model describe the low-temperature physics of NaV_2O_5 ?
• Magnetic excitations in charge- ordered NaV2O5
• Discussion of a spin-cluster model for the low temperature phase of NaV_2O_5

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