Charge-Ordered State versus Dimer-Mott Insulator at Finite Temperatures

Abstract

We theoretically investigate the competition between charge-ordered state and Mott insulating state at finite temperatures in quarter-filled quasi-one-dimensional electron systems, by studying dimerized extended Hubbard chains with interchain Coulomb interactions. In order to take into account one-dimensional fluctuations properly, we apply the bosonization method to an effective model obtained by the interchain mean-field approximation. The results show that lattice dimerization, especially in the critical region, and frustration in the interchain Coulomb interactions reduce the charge-ordering phase transition temperature and enlarge the dimer-Mott insulating phase. We also derive a general formula of the Knight shift in the charge-ordered phase and its implication to experiments is discussed.

5 pages, 4 figures, to be published in J. Phys. Soc. Jpn. Vol.76 No.10

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Cited by in corpus (6)

• Phase diagram and collective excitation in excitonic insulator: from the orbital physics viewpoint
• From charge- and spin-ordering to superconductivity in the organic charge-transfer solids
• Finite-Temperature Phase Diagram of Quasi-One-Dimensional Molecular Conductors: Quantum Monte Carlo Study
• 13C NMR study of the magnetic properties of the quasi-one-dimensional conductor, (TMTTF)2SbF6
• Magnetism and Charge ordering in TMTTF${}_2$-PF${}_6$ organic crystals
• Finite-Temperature Properties across the Charge Ordering Transition -- Combined Bosonization, Renormalization Group, and Numerical Methods