Effect of charge ordering on spin-Peierls state in low dimensional electron systems

A competition of the spin-Peierls state and the charge ordering is examined using a Peierls-Hubbard model with a quarter-filled band, dimerization and the nearest-neighbor repulsive interaction (V). In terms of the renormalization group method and the bosonization, it is found that the spin-Peierls state is strongly reduced when the charge ordering appears with increasing V. We discuss the relevance to the spin-Peierls state in organic conductors