2008/07/31 by Yuichi Otsuka, Hitoshi Seo, Yukitoshi Motome +1 · 1 citation
Materials Science · Physics and Astronomy · #Magnetism in coordination complexes #Organic and Molecular Conductors Research #Thermal Expansion and Ionic Conductivity #cond-mat.str-el
paper · pdf · doi:10.1143/jpsj.77.113705
published as J. Phys. Soc. Jpn. Vol. 77, 113705 (2008) · Corrected typos
openalex publication_date 2008/10/27 · arxiv created 2008/11/11 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Finite-temperature phase transitions in quasi-one-dimensional quarter-filled systems are investigated by the extended Hubbard model with electron-lattice coupling. Using a quantum Monte Carlo method combined with the inter-chain mean-field approximation, we clarify competing and coexisting behaviors among charge ordering, dimer Mott, and spin-Peierls states. It is pointed out that an anharmonicity of lattice distortions plays an important role in multi-critical behaviors. The results are compared with experimental data for quasi-one-dimensional molecular conductors such as DCNQI and TMTTF compounds.