氢分子与超导纳米结的相互作用
Interaction of hydrogen molecules with superconducting nanojunctions
摘要：
本文研究了氢分子与原子尺度超导纳米结的相互作用。电导直方图测量表明，铌、钽和铝超导体与氢之间存在强相互作用，而铅超导体与氢之间存在轻微的相互作用，锡和铟超导体与氢之间没有明显的相互作用。对于Nb、Ta和Pb，采用子能隙方法确定了氢环境下纳米结的传输本征值。结果表明，在Nb和Ta中，结的力学行为受到由极长电导迹线反射的氢的强烈影响，但基于透射本征值的电子性质与纯结相似。没有发现在电极之间形成单分子桥的证据-如最近研究的铂氢系统。
英文摘要：
In this paper the interaction of hydrogen molecules with atomic-sized superconducting nanojunctions is studied. It is demonstrated by conductance histogram measurements that the superconductors niobium, tantalum and aluminum show a strong interaction with hydrogen, whereas for lead a slight interaction is observed, and for tin and indium no significant interaction is detectable. For Nb, Ta and Pb subgap method is applied to determine the transmission eigenvalues of the nanojunctions in hydrogen environment. It is shown, that in Nb and Ta the mechanical behavior of the junction is spectacularly influenced by hydrogen reflected by extremely long conductance traces, but the electronic properties based on the transmission eigenvalues are similar to those of pure junctions. Evidences for the formation of a single-molecule bridge between the electrodes -- as in recently studied platinum hydrogen system -- were not found.
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