Influence of the anion potential on the charge ordering in quasi-one dimensional charge transfer salts

Details Influence of the anion potential on the charge ordering in quasi-one dimensional charge transfer salts Influence of the anion potential on the charge ordering in quasi-one dimensional charge transfer salts

2001-02-28

arxiv.org/abs/cond-mat/0102531v2

Physics

Condensed Matter

Strongly Correlated Electrons

Latex, 4 pages, 4 postscript figures

Scientific paper

10.1103/PhysRevB.63.241102

We examine the various instabilities of quarter-filled strongly correlated electronic chains in the presence of a coupling to the underlying lattice. To mimic the physics of the (TMTTF)$_2$X Bechgaard-Fabre salts we also include electrostatic effects of intercalated anions. We show that small displacements of the anion can stabilize new mixed Charged Density Wave-Bond Order Wave phases in which central symmetry centers are suppressed. This finding is discussed in the context of recent experiments. We suggest that the recently observed charge ordering is due to a cooperative effect between the Coulomb interaction and the coupling of the electronic stacks to the anions. On the other hand, the Spin-Peierls instability at lower temperature requires a Peierls-like lattice coupling.

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