Structure and magnetic properties of icosahedral Pd(x)Ag(13-x) (x = 0-13) clusters.
Structure and magnetic properties of icosahedral Pd(x)Ag(13-x) (x = 0-13) clusters.
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二十面体PdxAg13-x (x=0-13)团簇的结构和磁性能
DOI:
10.1038/s41598-017-10184-6
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发表时间:
2017-08-25
影响因子:
4.6
通讯作者:
Wan JG
中科院分区:
文献类型:
--
作者:
Fan B;Ge GX;Jiang CH;Wang GH;Wan JG
In this article, we present a modified Velocity-Verlet algorithm that makes cluster system converge rapidly and accurately. By combining it with molecular dynamics simulations, we develop an effective global sampling method for extracting isomers of bimetallic clusters. Using this method, we obtain the isomers of icosahedral PdxAg13−x (x = 0–13). Additionally, using the first-principle spin-polarized density functional theory approach, we find that each isomer still retains its icosahedral structure because of strong s-d orbital hybridization, and the cluster is more stable when a Pd atom is at the center of the cluster. With increasing x value, the magnetic moment decreases linearly from 5.0 μB at x = 0, until reaching zero at x = 5, and then increases linearly up to 8.0 μB at x = 13. By calculating the atom-projected density of states (PDOS), we reveal that the magnetic moment of PdxAg13−x mainly originates from s electrons of Ag when 0 ≤ x < 5, and d electrons of Pd when 5 < x ≤ 13. The PDOS results also show that the PdxAg13−x tends to transform from a semiconductor state to semi-metallic state when x gradually increases from 0 to 13.
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