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.

引用

页数：4

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