Competition of Dimerization and Charge Ordering in the Spin-Peierls State of Organic Conductors

Abstract

The effect of the charge ordering on the spin-Peierls (SP) state has been examined by using a Peierls-Hubbard model at quarter-filling with dimerization, on-site and nearest-neighbor repulsive interactions. By taking account of the presence of dimerization, a bond distortion is calculated variationally with the renormalization group method based on bosonization. When the charge ordering appears at V=V_c with increasing the nearest-neighbor interaction (V), the distortion exhibits a maximum due to competition between the dimerization and the charge ordering. It is shown that the second-order phase transition occurs from the SP state with the bond alternation to a mixed state with an additional component of the site alternationat V = V_c.

11 pages, 13 figures, to be published in J. Phys. Soc. Jpn. 72 No.6 (2003)

References in corpus (7)

• The ferroelectric Mott-Hubbard phase of organic (TMTTF)2X conductors
• Competition and coexistence of bond and charge orders in (TMTTF)2AsF6
• Charge Ordering in the One-Dimensional Extended Hubbard Model: Implication to the TMTTF Family of Organic Conductors
• Coexistence of Charge Order and Spin-Peierls Lattice Distortion in One-Dimensional Organic Conductors
• Crossover from Quarter-Filling to Half-Filling in a One-Dimensional Electron System with a Dimerized and Quarter-Filled Band
• Ising transition in a one-dimensional quarter-filled electron system with dimerization
• Correlation Effect on Peierls Transition

Cited by in corpus (4)

• Theoretical Aspects of Charge Ordering in Molecular Conductors
• Ground-state phase diagram of the one-dimensional half-filled extended Hubbard model
• Peierls ground state and excitations in the electron-lattice correlated system (EDO-TTF)_{2}X
• Finite-temperature phase transitions in quasi-one-dimensional molecular conductors