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Stable geometries and magnetic properties of neutral Snx+1 and FeSnx (x <= 8) clusters

机译:中性Snx + 1和FeSnx(x <= 8)团簇的稳定几何形状和磁性

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We report the results of calculations which were performed to investigate the magnetic properties and energetic properties of equilibrium structures of small FeSn (x) (x = 1-8) clusters, within the framework of the density functional theory by using the SIESTA code. The presence of the Fe impurity modifies the equilibrium geometries and the spin state of the free Sn clusters. All the FeSn clusters present magnetic order and show a dependence with the concentration x; in some cases the magnetic order into the cluster is ferromagnetic-like, generally the magnetic coupling in Sn atoms is ferromagnetic-like but our results show than in some clusters coexist the antiferromagnetic-like order with the ferromagnetic-like order in the Sn atoms. We have studied the fragmentation of the clusters and our results show the absence of a predominant fragmentation channel. The presence of the impurity induces a low value of HOMO-LUMO gap with respect to free Sn clusters.
机译:我们报告了计算的结果,这些结果是通过使用SIESTA代码在密度泛函理论的框架内研究小的FeSn(x)(x = 1-8)团簇的平衡结构的磁性能和高能性能的。 Fe杂质的存在改变了自由Sn团簇的平衡几何形状和自旋态。所有的FeSn团簇都具有磁序,并表现出对浓度x的依赖性。在某些情况下,进入团簇的磁性顺序是铁磁性的,通常在Sn原子中的磁耦合是类似铁磁性的,但是我们的结果表明,在某些簇中,Sn原子中反铁磁性的顺序与类似铁磁性的顺序共存。我们研究了簇的碎片,我们的结果表明没有主要的碎片通道。相对于自由的Sn簇,杂质的存在引起较低的HOMO-LUMO间隙值。

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