Competition of Dimerization and Charge Ordering in the Spin-Peierls State of Organic Conductors

Details Competition of Dimerization and Charge Ordering in the Spin-Peierls State of Organic Conductors Competition of Dimerization and Charge Ordering in the Spin-Peierls State of Organic Conductors

2003-03-19

arxiv.org/abs/cond-mat/0303380v2

Physics

Condensed Matter

Strongly Correlated Electrons

11 pages, 13 figures, to be published in J. Phys. Soc. Jpn. 72 No.6 (2003)

Scientific paper

10.1143/JPSJ.72.1458

The effect of the charge ordering on the spin-Peierls (SP) state has been examined by using a Peierls-Hubbard model at quarter-filling with dimerization, on-site and nearest-neighbor repulsive interactions. By taking account of the presence of dimerization, a bond distortion is calculated variationally with the renormalization group method based on bosonization. When the charge ordering appears at V=V_c with increasing the nearest-neighbor interaction (V), the distortion exhibits a maximum due to competition between the dimerization and the charge ordering. It is shown that the second-order phase transition occurs from the SP state with the bond alternation to a mixed state with an additional component of the site alternationat V = V_c.

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