Ca3Co2O6中长波磁调制的起源
Origin of the long-wavelength magnetic modulation in Ca3Co2O6
摘要：
考虑到可能的链间超超交换路径，讨论了Ca_3Co_2O_6的长波无公度磁结构的起源。传播矢量k=（0，0，$Δ$）且$Δ$ $>$ 1的实验值只有在考虑下一个最近的超-超交换相互作用时才能重现。使用扩展休克尔紧束缚方法的自旋二聚体分析证实，尽管原子间的Co-Co距离较长，后者的相互作用确实要强得多。所观察到的结构相对于某些相称的状态的稳定性进行了讨论。
英文摘要：
The origin of the long-wavelength incommensurate magnetic structure of Ca3Co2O6 is discussed considering possible inter-chains super-superexchange paths. The experimental value of the propagation vector k=(0,0,$Δ$) with $Δ$ $>$ 1 can be reproduced only if one considers the next nearest super-superexchange interaction. A spin-dimer analysis using the Extended-Huckel Tight-Binding method confirms that, despite longer interatomic Co-Co distances, the latter interaction is indeed much stronger. The stability of the observed structure with respect to certain commensurate states is discussed.
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