Influence of the anion potential on the charge ordering in quasi-one-dimensional charge-transfer salts
Influence of the anion potential on the charge ordering in quasi-one-dimensional charge-transfer salts
复制标题
阴离子电势对准一维电荷转移盐中电荷排序的影响
DOI：
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
Jose RieraDidier Poilblanc
中科院分区：
文献类型：
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作者：
Jose RieraDidier Poilblanc
我们研究了四分之一填充的强相关电子链在与底层晶格耦合的情况下的各种不稳定性。为了模拟四甲基四thiafulven$ (mathm {TMTTF}{)}_{2}X$ becchgaard - fabre盐的物理性质，我们还包括插层阴离子的静电效应。我们发现阴离子的小位移可以稳定中心对称中心被抑制的新的混合电荷密度波的键序波相。在最近的实验中讨论了这一发现。我们认为，最近观察到的电荷排序是由于库仑相互作用和电子堆栈与阴离子的耦合之间的协同效应。另一方面，在较低温度下的自旋-佩尔斯不稳定性需要类似佩尔斯的晶格耦合。
We examine the various instabilities of quarter-filled strongly correlated electronic chains in the presence of a coupling to the underlying lattice. To mimic the physics of the tetramethyltetrathiafulvene $(mathrm{TMTTF}{)}_{2}X$ Bechgaard-Fabre salts we also include electrostatic effects of intercalated anions. We show that small displacements of the anion can stabilize new mixed charged-density wavechar21{}bond order wave phases in which central symmetry centers are suppressed. This finding is discussed in the context of recent experiments. We suggest that the recently observed charge ordering is due to a cooperative effect between the Coulomb interaction and the coupling of the electronic stacks to the anions. On the other hand, the Spin-Peierls instability at lower temperature requires a Peierls-like lattice coupling.