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arXiv 0707.4555cond-mat.mes-hall
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Pt单原子链的力学性质

Mechanical properties of Pt monatomic chains

T. Shiota, A. I. Mares, A. M. C. Valkering, T. H. Oosterkamp, J. M. van Ruitenbeek

摘要:

利用我们新开发的机械可控断裂结(MCBJ)技术,以音叉作为力传感器,通过同时测量铂单原子链的有效刚度和电导,研究了铂单原子链的力学性质.当拉伸单原子接触(两原子链)时,刚度和电导在拉伸的早期阶段增加,然后在断裂之前减小,这归因于链构型的转变和键弱化。对单原子链的力学性质进行了统计分析。平均刚度在长度直方图的峰值位置处显示最小值。从这个结果中,我们得出结论,在长度直方图中的峰是在链中的原子的数量的测量,并且链从应变状态断裂。此外,我们发现,链的初始刚度越小,链变得越长。这表明较软的链条可以拉伸得更长。

英文摘要:

The mechanical properties of platinum monatomic chains were investigated by simultaneous measurement of an effective stiffness and the conductance using our newly developed mechanically controllable break junction (MCBJ) technique with a tuning fork as a force sensor. When stretching a monatomic contact (two-atom chain), the stiffness and conductance increases at the early stage of stretching and then decreases just before breaking, which is attributed to a transition of the chain configuration and bond weakening. A statistical analysis was made to investigate the mechanical properties of monatomic chains. The average stiffness shows minima at the peak positions of the length-histogram. From this result we conclude that the peaks in the length-histogram are a measure of the number of atoms in the chains, and that the chains break from a strained state. Additionally, we find that the smaller the initial stiffness of the chain is, the longer the chain becomes. This shows that softer chains can be stretched longer.

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