Charge Ordering in θ-(BEDT-TTF)2X Materials
- 1 August 2002
- journal article
- Published by Physical Society of Japan in Journal of the Physics Society Japan
- Vol. 71 (8) , 1816-1819
- https://doi.org/10.1143/jpsj.71.1816
Abstract
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.Comment: 4 pages, 4 eps figures, uses jpsj2.clKeywords
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