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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Frustration in rare earth intermetallic compounds
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Frustration in rare earth intermetallic compounds

机译：稀土金属间化合物的失意

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摘要

The intermetallic compounds of rare earths with non-magnetic metals exhibit a large variety of magnetic behaviours arising from the competition of long-range exchange interactions between 4f ions in the presence of magnetocrystalline anisotropy. This competition results in frustrated magnetic states such as collinear incommensurate, helimagnetic. fan, long-period commensurate or antiphase structures. The anisotropy plays a crucial role in the existence and temperature dependence of these structures, according to the uniaxial (Ising-like) or planar (XY) character of the compounds, as well as to the Kramers or non-Kramers type of the rare earth. In some peculiar situations, mixed magnetic structures may even occur at low temperature, where two kinds of equivalent magnetic sites coexist, with a high- h and a low-moment state, respectively. The addition of antiferroquadrupolar coupling may also favour multiaxial, multi-Q antiferromagnetic structures, in particular in cubic systems. In all these cases, applying a magnetic field results in magnetization processes showing a metamagnetic behaviour, with the presence of one or several well-defined plateaus separated by more or less sharp transitions. A thorough microscopic analysis of all these phenomena can be carried out by using an appropriate model. such as the self-consistent periodic field model. A few examples will illustrate the various effects of frustration in these intermetallic magnetic systems.
机译：稀土与非磁性金属的金属间化合物表现出多种磁行为，这是由于在存在磁晶各向异性的情况下4f离子之间的长距离交换相互作用所引起的。这种竞争导致沮丧的磁性状态，例如共线不相称的，日磁性的。风扇，长期相称或反相结构。根据化合物的单轴（类Ising）或平面（XY）特征以及稀土的Kramers或非Kramers型，各向异性在这些结构的存在和温度依赖性中起着至关重要的作用。 。在某些特殊情况下，混合磁结构甚至可能在低温下发生，在低温下，两种等效磁点共存，分别处于高磁矩和低磁矩状态。反铁四极耦合的添加也可能有利于多轴，多Q反铁磁结构，特别是在立方系统中。在所有这些情况下，施加磁场都会导致磁化过程显示出亚磁行为，同时存在一个或多个良好定义的平台，这些平台被或多或少的尖锐过渡区分开。可以使用适当的模型对所有这些现象进行彻底的微观分析。例如自洽周期场模型。一些例子将说明在这些金属间磁性系统中挫折的各种影响。

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