Charge Ordering and Spin gap in NaV_2O_5

Details Charge Ordering and Spin gap in NaV_2O_5 Charge Ordering and Spin gap in NaV_2O_5

1998-05-15

arxiv.org/abs/cond-mat/9805185v1

J. Phys. Soc. Jpn. 67 (1998), pp. 2602-2605

Physics

Condensed Matter

Strongly Correlated Electrons

3 pages, 4 figures, submitted to J. Phys. Soc. Jpn

Scientific paper

10.1016/S0022-3697(99)00056-6

A possible ground state of NaV_2O_5 is proposed based on the Hartree approximation for both on-site and intersite Coulomb interactions. The results indicate that the intersite Coulomb interaction induces a zigzag type of charge disproportionation (i.e. charge ordering) along the ladders of V-ions resulting in the localized spins between neighboring ladders to form a spin gap. This new state, which is different from the spin-Peierls state so far believed, seems to be consistent with the existing experimental results.

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