Magnon splitting induced by charge ordering in NaV_2O_5

Abstract

We consider the effects of charge ordering in NaV_2O_5 (below T_SP) on the exchange constants and on the magnon dispersion. We show that the experimentally observed splitting of the magnon branches along the a direction is induced by charge ordering. We find that one can distinguish between the proposed 'zig-zag' and 'in-line' patterns of charge ordering. Only the zig-zag ordering is consistent with the experimental results regarding (i) the unusual intensity modulation observed in magnetic neutron scattering, (ii) the reduction in the intra-ladder exchange constant below T_SP, and (iii) the magnon dispersion along a. We estimate the inter-ladder exchange constant to be 1.01meV=11.7K for T>T_SP.

final version for PRL

References in corpus (7)

• 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
• Charged Magnons in NaV2O5
• Charge ordering and spin- Peierls transition in alpha'-NaV2O5
• Phase Diagram of the S = 1/2 Frustrated Coupled Ladder System
• Magnetic Excitations in quasi two-dimensional Spin-Peierls Systems

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• Simultaneous Charge Ordering and Spin Dimerization in Quasi-Two-Dimensional Quarter-Filled Ladders
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• Discussion of a spin-cluster model for the low temperature phase of NaV_2O_5
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