Abstract
A review is given for recent theoretical studies on phase transitions in quasi-one-dimensional molecular conductors with a quarter-filled band. By lowering temperature, charge transfer salts exhibit a variety of transitions accompanying symmetry breaking, such as charge ordering, lattice dimerization, antiferromagnetic transition, spin-Peierls distortion, and so on. Analyses on microscopic quasi-one-dimensional models provide their systematic understandings, by the complementary use of different analytical and numerical techniques; they can reproduce finite-temperature phase transitions, whose results can be directly compared with experiments and give feedbacks to material design.
Highlights
Low-dimensional molecular conductors exhibit interplay between electron correlation highlighted by enhanced fluctuation and coupling to the lattice degree of freedom
We find the co-existence of dimerization and tetramerization [18,19]; This can be interpreted as the spontaneous formation of the DM state, leading to charge localization, the SP singlet formation
The studies on charge order (CO) as an origin of insulating behavior in the 2:1 charge transfer salts pointed to the importance of the strong-correlation effects, U and V
Summary
Low-dimensional molecular conductors exhibit interplay between electron correlation highlighted by enhanced fluctuation and coupling to the lattice degree of freedom. 4kF bond order: 2a modulation of the bonds, namely, dimerization in the transfer integrals makes the system effectively half-filled, the on-site Coulomb interaction can drive the system to a Mott insulating state. This is called as the dimer-Mott (DM) insulating state.
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