Charge Ordering in ?-(BEDT-TTF) 2 X Materials
Charge Ordering in ?-(BEDT-TTF) 2 X Materials
复制标题
?-(BEDT-TTF) 2 X 材料中的电荷排序
DOI:
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发表时间:
2002
期刊:
影响因子:
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通讯作者:
D. Campbell
中科院分区:
文献类型:
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作者:
R. T. Clay;S. Mazumdar;D. Campbell
We theoretically investigate charge ordered states on the anisotropic triangular lattice characteristic of the θ-(BEDT-TTF) 2 X materials. Using exact diagonalization studies, we establish that the charge order (CO) pattern corresponds to a “horizontal” stripe structure, with (dots)1100(dots) CO along the two directions with larger electron hopping ( p -directions), and (dots)1010(dots) 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 occurrence of a charge-induced high temperature transition as well as a spin gap transition at lower temperature.