Magnon splitting induced by charge ordering in NaV_2O_5

Details Magnon splitting induced by charge ordering in NaV_2O_5 Magnon splitting induced by charge ordering in NaV_2O_5

1998-09-10

arxiv.org/abs/cond-mat/9809154v2

Phys. Rev. Lett. 82, 976 (1999)

Physics

Condensed Matter

final version for PRL

Scientific paper

10.1103/PhysRevLett.82.976

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.

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