Finite-temperature phase transitions in quasi-one-dimensional molecular conductors

Details Finite-temperature phase transitions in quasi-one-dimensional molecular conductors Finite-temperature phase transitions in quasi-one-dimensional molecular conductors

2006-11-19

arxiv.org/abs/cond-mat/0611499v3

J. Phys. Soc. Jpn. Vol. 76, 013707 (2007)

Physics

Condensed Matter

Strongly Correlated Electrons

to be published in J. Phys. Soc. Jpn., Vol. 76 (2007) No. 1 (5 pages, 4 figures); typo corrected

Scientific paper

10.1143/JPSJ.76.013707

Phase transitions in 1/4-filled quasi-one-dimensional molecular conductors are studied theoretically on the basis of extended Hubbard chains including electron-lattice interactions coupled by interchain Coulomb repulsion. We apply the numerical quantum transfer-matrix method to an effective one-dimensional model, treating the interchain term within mean-field approximation. Finite-temperature properties are investigated for the charge ordering, the "dimer Mott" transition (bond dimerization), and the spin-Peierls transition (bond tetramerization). A coexistent state of charge order and bond dimerization exhibiting dielectricity is predicted in a certain parameter range, even when intrinsic dimerization is absent.

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