镧系和锕系元素中的伊辛交换相互作用
Ising exchange interaction in lanthanides and actinides
摘要：
伊辛交换相互作用是强交换各向异性的极限情况，并且代表许多磁性材料的关键性质。在这里，我们找到必要和充分的条件，实现伊辛交换相互作用的金属网站与未淬灭的轨道时刻。与目前的观点相反，这里建立的规则缩小了镧系和锕系离子的范围，可以表现出伊辛交换相互作用。结果表明，所产生的伊辛相互作用可以是两种不同的类型：（i）同轴的，与磁矩沿各向异性轴上的金属网站和（ii）非同轴的，与任意取向的磁矩之一。这些发现将有助于有目的地设计镧系和锕系元素为基础的材料。
英文摘要：
The Ising exchange interaction is a limiting case of strong exchange anisotropy and represents a key property of many magnetic materials. Here we find necessary and sufficient conditions to achieve Ising exchange interaction for metal sites with unquenched orbital moments. Contrary to current views, the rules established here narrow much the range of lanthanide and actinide ions which can exhibit Ising exchange interaction. It is shown that the arising Ising interaction can be of two distinct types: (i) coaxial, with magnetic moments directed along the anisotropy axes on the metal sites and (ii) non-coaxial, with arbitrary orientation of one of magnetic moments. These findings will contribute to purposeful design of lanthanide and actinide based materials.
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