2001/02/28 by J. Riera, Jose Riera, Didier Poilblanc · 4 citations
Engineering · Materials Science · Physics and Astronomy · #Magnetism in coordination complexes #Organic and Molecular Conductors Research #Perovskite Materials and Applications #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.63.241102
Latex, 4 pages, 4 postscript figures
arxiv created 2001/03/21 · openalex publication_date 2001/05/30 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
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 tetramethyltetrathiafulvene (TMTTF)2X 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.