Magnetic and quadrupolar properties of DyCu and related dysprosium cubic compounds
Magnetic and quadrupolar properties of DyCu and related dysprosium cubic compounds
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DyCu 和相关镝立方化合物的磁性和四极特性
DOI：
10.1016/0304-8853(84)90361-5
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发表时间：
1984
影响因子：
2.7
通讯作者：
J. Rouchy
中科院分区：
文献类型：
--
作者：
R. Aléonard;P. Morin;J. Rouchy
对DyCu的磁弹性性质的研究使我们能够明确地表明其磁结构是三q型的。它由4对铁磁自旋组成，沿着三重轴中的每一个指向。缺乏任何自发磁致伸缩，尽管一个大的磁弹性耦合同意与立方对称的三重q结构，这是稳定的三角对称的负四极相互作用。一个相干分析的复杂磁化过程中施加的磁场沿着三个主要的结晶方向，然后提出。CsCl型结构，DyAg，DyZn和DyCd内的其他相关化合物的比较揭示了四极相互作用的重要作用，与晶体电场水平计划。晶体场有利于三重轴作为所有四种化合物的易磁化方向。在DyAg和DyCu中，三角对称的负四极相互作用的加入导致观察到的非共线结构;在DyZn和DyCd中，正四极相互作用足够强，以建立沿沿着四重轴的共线排列。
The study of the magnetoelastic properties of DyCu allows us to show unambiguously that the magnetic structure is of the triple-qtype. It consists of 4 pairs of ferromagnetic spins pointing along each of the threefold axes. The lack of any spontaneous magnetostriction in spite of a large magnetoelastic coupling agrees with the cubic symmetry of triple-qstructure, which is shown to be stabilized by negative quadrupolar interactions of trigonal symmetry. A coherent analysis of the complex magnetization processes for magnetic fields applied along the three main crystallographic directions is then proposed. A comparison with other related compounds within the CsCl-type structure, DyAg, DyZn and DyCd reveals the important role of the quadrupolar interactions, in connection with the crystalline electric field level schemes. The crystal field favours the threefold axes as the easy magnetization direction for all the four compounds. In DyAg and DyCu, the addition of negative quadrupolar interactions of trigonal symmetry leads to observed non-collinear structures; in DyZn and DyCd, the positive tetragonal quadrupolar interactions are strong enough to establish a collinear arrangement along a fourfold axis.