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Ab initio study of structural stability of small 3d late transition metal clusters: Interplay of magnetization and hybridization

机译:从头开始研究3d后期过渡金属小簇的结构稳定性:磁化和杂交的相互作用

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Using first-principles density-functional-theory-based calculations, we analyze the structural stability of small clusters of 3d late transition metals. We consider the relative stability of the two structures: layer-like structures with hexagonal closed packed stacking and more compact structures of icosahedral symmetry. We find that the Co clusters show an unusual stability in hexagonal symmetry compared to the small clusters of other members, which are found to stabilize in icosahedral-symmetry-based structure. Our study reveals that this is driven by the interplay between the magnetic-energy gain and the gain in covalency through the s-d hybridization effect. Although we have focused our study primarily on clusters with 19 atoms, we find this behavior to be general for clusters with between 15 and 20 atoms.
机译:使用基于第一原理密度泛函理论的计算,我们分析了3d晚过渡金属小簇的结构稳定性。我们考虑了这两种结构的相对稳定性:具有六角形密堆积的层状结构和更紧凑的二十面体对称结构。我们发现,与其他成员的小簇相比,Co簇在六边形对称性方面显示出不同寻常的稳定性,这些小簇在基于二十面体对称性的结构中稳定。我们的研究表明,这是受s-d杂交效应的磁能增益和共价增益之间相互作用的驱动。尽管我们的研究主要集中在19个原子的簇上,但是我们发现这种行为对于15到20个原子的簇是普遍的。

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