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The dilemma of Cr~(III)Ni~(II) exchange interactions: Ferromagnetism versus antiferromagnetism

机译:Cr〜(III)Ni〜(II)交换相互作用的困境:铁磁性与反铁磁性

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摘要

The sign of the exchange interaction in dinuclear Cr~(III)Ni ~(II) complexes was analyzed using theoretical methods based on density functional theory. This approach allowed us to reproduce the experimental J values correctly. In addition, the Kahn-Briat model, which uses the square of the sum of the overlaps between the magnetic orbitals to correlate with the exchange coupling constant, provided a reasonable correlation between the different types of Cr~(III)Ni~(II) complexes when using biorthogonalized orbitals. We also examined the exchange interactions in two polynuclear Cr~(III)Ni~(II) complexes: a Cr_7Ni ring and an S-shaped Cr_(12)Ni_3 complex. We concluded that both systems exhibit antiferromagentic interactions, and that the Cr ~(III)?Ni~(II) interactions are similar in value to the Cr~(III)?Cr~(III) exchange couplings.
机译:利用基于密度泛函理论的理论方法分析了双核Cr〜(III)Ni〜(II)配合物中交换相互作用的符号。这种方法使我们能够正确地再现实验J值。此外,利用磁轨道之间重叠部分之和的平方与交换耦合常数相关的Kahn-Briat模型提供了不同类型的Cr〜(III)Ni〜(II)之间的合理关联。使用双正交化的轨道时会形成复合物。我们还研究了两种多核Cr_(III)Ni〜(II)配合物中的交换相互作用:一个Cr_7Ni环和一个S形Cr_(12)Ni_3配合物。我们得出的结论是,这两个系统都表现出抗铁剂相互作用,并且Cr〜(III)→Ni〜(II)相互作用的值与Cr〜(III)→Cr〜(III)交换耦合相似。

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