Charge-Ordered State versus Dimer-Mott Insulator at Finite Temperatures(Condensed matter : electronic structure and electrical, magnetic, and optical properties)
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概要
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We theoretically investigate the competition between charge-ordered state and Mott insulating state at finite temperatures in quarter-filled quasi-one-dimensional electron systems, by studying dimerized extended Hubbard chains with interchain Coulomb interactions. In order to take into account one-dimensional fluctuations properly, we apply the bosonization method to an effective model obtained by the interchain mean-field approximation. The results show that lattice dimerization, especially in the critical region, and frustration in the interchain Coulomb interactions reduce the charge-ordering phase transition temperature and enlarge the dimer-Mott insulating phase. We also derive a general formula of the Knight shift in the charge-ordered phase and its implication to experiments is discussed.
- 2007-10-15
著者
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Tsuchiizu Masahisa
Department Of Physics Nagoya University
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Seo Hitoshi
Synchrotron Radiation Research Center Japan Atomic Energy Agency
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Yoshioka Hideo
Department Of Physics Faculty Of Science University Of Tokyo
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Yoshioka Hideo
Department Of Oral And Maxillofacial Surgery Osaka Rosai Hospital
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Tsuchizu Masahisa
Department Of Physics Nagoya University
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Yoshioka Hideo
Department of Physics, Nara Women's University
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