Finite-Temperature Phase Diagram of Quasi-One-Dimensional Molecular Conductors: Quantum Monte Carlo Study
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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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
DOI：
10.1143/JPSJ.77.113705
被引量：
年份：
2008
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