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Density-functional investigation of alloyed metallic nanowires

机译:合金化金属纳米线的密度泛函研究

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Density-functional band-structure calculations for two-shell metallic nanowires from Au and from AgAu and PdAu alloys yield an increasing stability of the wires in the order [PdAu8](n) < [Au-9](n) < [AgAu8](n). This trend coincides with the tensile stress obtained for a monatomic wire at the equilibrium geometry of the central monatomic chain. An electronic structure analysis shows that in Au-9 and AgAu8 the central conductance channel is populated, in PdAu8 not. An analogous depopulation is obtained for Au-9 and AgAu8 only by straining the wires in the elastic regime. These findings rationalize the lower conductivity of PdAu nanocontacts; compared with AgAu contacts obtained by break junction experiments. (c) 2005 Elsevier B.V. All rights reserved.
机译:用Au和AgAu和PdAu合金制成的两层金属纳米线的密度泛函带结构计算得出,线的稳定性按[PdAu8](n)<[Au-9](n)<[AgAu8]的顺序增加。 (n)。该趋势与在中心单原子链的平衡几何形状下针对单原子线获得的拉伸应力一致。电子结构分析表明,在Au-9和AgAu8中填充了中央电导通道,而在PdAu8中则没有。仅通过在弹性状态下拉紧导线,即可获得Au-9和AgAu8的类似种群。这些发现合理化了PdAu纳米接触的较低电导率。与通过断裂连接实验获得的AgAu触点进行了比较。 (c)2005 Elsevier B.V.保留所有权利。

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