J. Phys. IV France 12 (2002) Pr9-205
Co-existence of charge order and spin Peierls lattice distortion in one-dimensional organic compoundsH. Seo1, 2, M. Kuwabara3 and M. Ogata4
1 Correlated Electron Research Center (CERC), AlST Tsukuba Central 4, lbaraki 305-8562, Japan
2 Domestic Research Fellow, Japan Society of the Promotion of Science, Tokyo 102-8471, Japan
3 Molecular Photoscience Research Center (MPRC), Kobe University, Kobe 657-8501, Japan
4 Department of Physics, University of Tokyo, Tokyo 113-0033, Japan
The ground state properties of the organic spin-Peierls compounds with one-dimensional quarter-filled band are investigated theoretically. In the strongly correlated regime, two insulating states compete to each other, which are the charge ordered state due to the inter-site Coulomb interaction, and the `dimer Mott' insulating state due to the combined effects of the electron-phonon and the on-site Coulomb interactions. In both of these states, the electron-phonon interaction further produces the lattice tetramization, which is interpreted as the spin-Peierls state.
© EDP Sciences 2002