Rung-singlet charge-ordering in alpha'-NaV2O5

Details Rung-singlet charge-ordering in alpha'-NaV2O5 Rung-singlet charge-ordering in alpha'-NaV2O5

2003-05-20

arxiv.org/abs/cond-mat/0305479v1

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 3 EPS figures

Scientific paper

We show that the proposed zig--zag charge--ordering model for alpha'--NaV2O5 is incompatible with a single transition that induces both charge--ordering and spin gap. We introduce a two--band model for alpha'--NaV2O5 within which the simultaneous charge--spin order transition is driven principally by electron-phonon interactions. The spin gap is due to the formation of local dimers, thus explaining the weak magnetic effect on this transition.

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