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首页> 外文期刊>Bulletin of the Chemical Society of Japan >Magnetic Properties of Mixed Triangle-Based Laddler Magnets (C-1TET-TTF)(FeBr_4)_(1-x)(FeCl_4)_x (C_1TET-TTF: 4,5-Ethylenedithio-4',5'-bis(methylthio)tetrathiafluvalene)
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Magnetic Properties of Mixed Triangle-Based Laddler Magnets (C-1TET-TTF)(FeBr_4)_(1-x)(FeCl_4)_x (C_1TET-TTF: 4,5-Ethylenedithio-4',5'-bis(methylthio)tetrathiafluvalene)

机译：混合三角基拉德勒磁铁（C-1TET-TTF）（FeBr_4）_（1-x）（FeCl_4）_x（C_1TET-TTF：4,5-Ethylenedithio-4'，5'-bis（methylthio）的磁性四硫氟戊烯）

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摘要

Isostructural magnets (Cl TET -1TF)FeX_4 (X = Br, CI) are featured with a triangle-based ladder lattice comprised of an Fe3+ zigzag chain where a donor dimer bridges between next nearest neighboring Fe3+ sites. The FeC4- salt is an anti- ferromagnet with its easy axis tilted from the ladder sheet, the FeBr4- salt shows weak ferromagnetism, with the easy axis of its antiferromagnetic behavior lying on the sheet. We investigate the magnetic properties of mixed crystal (C1 TET- TTF)(FeBr4)I-x(FeCI4)x in order to reveal the origin of the differences in magnetism. The strengths of the exchange inter- actions varying with x can be understood on the basis of the inter-anion/donor atomic contact lengths in the crystal. Weak ferromagnetism survives with its easy axis tilted from the sheet in the concentration region x = 0.2. Then weak ferromag- netism disappears above x ~ 0.42. In the high concentration range x -0.4-0.8, the ordered state deviates from an ordinary antiferromagnet, due to the competition between two constituent exchange interactions. However, the possibility of a spi- ral spin which configuration theory predicts is not conclusive. The magnetic anisotropy, whose direction varies depending on x, is a consequence of the competition between the dipole-dipole interaction and the single-ion anisotropy.
机译：同构磁铁（Cl TET -1TF）FeX_4（X = Br，CI）的特征是基于三角形的梯形晶格，该晶格由Fe3 +曲折链组成，供体二聚体在相邻的相邻Fe3 +位点之间架桥。 FeC4-盐是一种反铁磁体，其易轴从梯形薄板倾斜，FeBr4-盐显示弱的铁磁性，其反铁磁行为的易轴位于薄板上。我们研究混合晶体（C1 TET-TTF）（FeBr4）I-x（FeCl4）x的磁性，以揭示磁性差异的起源。可以根据晶体中阴离子/施主之间的原子接触长度来理解随x变化的交换相互作用的强度。弱铁磁性以其易轴从薄板在浓度区域x = 0.2倾斜的角度保留下来。然后，弱铁磁性在x〜0.42以上消失。在x -0.4-0.8的高浓度范围内，由于两个组成交换相互作用之间的竞争，有序状态偏离了普通的反铁磁体。但是，构型理论预测的螺旋自旋的可能性尚无定论。磁各向异性的方向取决于x，是偶极-偶极相互作用和单离子各向异性之间竞争的结果。

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