Charge ordering in theta-(BEDT-TTF)_2 X materials

Details Charge ordering in theta-(BEDT-TTF)_2 X materials Charge ordering in theta-(BEDT-TTF)_2 X materials

2002-03-12

arxiv.org/abs/cond-mat/0203266v1

J. Phys. Soc. Japan, vol 71 no. 8, 1816 (2002)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 eps figures, uses jpsj2.cls

Scientific paper

10.1143/JPSJ.71.1816

We investigate theoretically charge ordered states on the anisotropic triangular lattice characteristic of the theta-(BEDT-TTF)_2 X materials. Using exact diagonalization studies, we establish that the charge order (CO) pattern corresponds to a ``horizontal'' stripe structure, with ...1100... CO along the two directions with larger electron hopping (p-directions), and ...1010... CO along the third direction (c-direction). The CO is accompanied by co-operative bond dimerizations along all three directions in the highest spin state. In the lowest spin state bonds along the p-directions are tetramerized. Our theory explains the occurence of a charge-induced high temperature transition as well as a spin gap transition at lower temperature.

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