Finite-Temperature Phase Diagram of Quasi-One-Dimensional Molecular Conductors: Quantum Monte Carlo Study

被引：30
|
作者：
Otsuka, Yuichi [1 ,2 ]
Seo, Hitoshi [2 ]
Motome, Yukitoshi [3 ]
Kato, Takeo [4 ]
机构：
[1] Japan Sci & Technol Agcy, CREST, Kawaguchi, Saitama 3320012, Japan
[2] SPring 8, Synchrotron Radiat Res Ctr, Japan Atom Energy Agcy, Sayo, Hyogo 6795148, Japan
[3] Univ Tokyo, Dept Appl Phys, Bunkyo Ku, Tokyo 1138656, Japan
[4] Univ Tokyo, Inst Solid State Phys, Chiba 2778581, Japan
来源：
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 2008年 / 77卷 / 11期
关键词：
quasi-one-dimensional molecular conductors; extended Hubbard model; electron-lattice coupling; charge ordering; lattice dimerization; spin-Peierls transition; SSE Monte Carlo method;
D O I：
10.1143/JPSJ.77.113705
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Finite-temperature phase transitions in quasi-one-dimensional quarter-filled systems are investigated using the extended Hubbard model with electron-lattice coupling. By a quantum Monte Carlo method combined with interchain 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 multicritical behaviors. The results are compared with experimental data for quasi-one-dimensional molecular conductors such as DCNQI and TMTTF compounds.
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页数：4
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