Magnetic Properties of Mixed Triangle-Based Ladder Magnets (C1TET-TTF)(FeBr4)1 - x(FeCl4)x (C1TET-TTF: 4,5-Ethylenedithio-4′,5′-bis(methylthio)tetrathiafulvalene)
Magnetic Properties of Mixed Triangle-Based Ladder Magnets (C1TET-TTF)(FeBr4)1 - x(FeCl4)x (C1TET-TTF: 4,5-Ethylenedithio-4′,5′-bis(methylthio)tetrathiafulvalene)
复制标题
混合三角形梯形磁体 (C1TET-TTF)(FeBr4)1 - x(FeCl4)x (C1TET-TTF: 4,5-乙二硫基-4′,5′-双(甲硫基)四硫富瓦烯)的磁性能
DOI：
10.1246/bcsj.74.459
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发表时间：
2001
影响因子：
4
通讯作者：
T. Enoki
中科院分区：
文献类型：
--
作者：
M. Enomoto;A. Miyazaki;T. Enoki
同构磁体（C1TET-TTF）FeX4 （X = Br, Cl）具有由Fe3+之字形链组成的三角形阶梯晶格，其中供体二聚体桥接在邻近的Fe3+位点之间。FeCl4-盐是一种易轴倾斜于阶梯片的反铁磁体，而fe4 -盐表现为弱铁磁性，其反铁磁行为的易轴位于阶梯片上。我们研究了混合晶体（C1TET-TTF）（FeBr4）1 - x (FeCl4)x的磁性能，以揭示磁性差异的来源。交换相互作用的强度随x的变化可以根据晶体中阴离子/给体原子的接触长度来理解。弱铁磁性在浓度区x≈0.2存在，其轴线容易偏离薄片。弱铁磁性在x≥0.42以上消失。在高浓度范围x ~ 0.4-0.8，有序态偏离普通的反铁磁体，由于两个对立面之间的竞争。
Isostructural magnets (C1TET-TTF)FeX4 (X = Br, Cl) 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 FeCl4- salt is an antiferromagnet 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 (C1TET-TTF)(FeBr4)1 - x (FeCl4)x in order to reveal the origin of the differences in magnetism. The strengths of the exchange interactions 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 ferromagnetism 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 cons...