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首页> 外文期刊>Physical review >Effect of hydrogen molecules on the electronic transport through atomic-sized metallic junctions in the superconducting state
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Effect of hydrogen molecules on the electronic transport through atomic-sized metallic junctions in the superconducting state

机译：氢分子对电子在超导状态下通过原子大小的金属结的电子输运的影响

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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 the subgap method is applied to determine the transmission eigenvalues of the nanojunctions in hydrogen environment. It is shown that the behavior of Nb and Ta nanojunctions is strongly modified by hydrogen molecules as reflected by the pronounced changes in the conductance histogram, the appearance of extremely long conductance traces, and the observation of negative differential conductance phenomenon in the dI/dV curve. Surprisingly the transport properties based on the measured transmission eigenvalues are similar to those of pure junctions. Our results imply that in Nb and Ta the interaction with hydrogen causes a plastic, ductile behavior and the formation of long nanoscale necks, but no well-defined single-molecule contacts are formed, and the transport properties are still dominated by Nb and Ta.
机译：本文研究了氢分子与原子大小的超导纳米结的相互作用。电导直方图测量结果表明，超导体铌，钽和铝显示出与氢的强相互作用，而对于铅则观察到轻微的相互作用，而对于锡和铟则没有明显的相互作用。对于Nb，Ta和Pb，应用子能隙法确定氢环境中纳米结的透射本征值。结果表明，氢分子强烈修饰了Nb和Ta纳米结的行为，这反映在电导直方图的明显变化，极长的电导痕迹的出现以及在dI / dV曲线中观察到负微分电导现象的反映。 。出乎意料的是，基于测得的传输特征值的传输特性与纯交界点相似。我们的结果表明，在Nb和Ta中，与氢的相互作用会引起塑性，延展性，并形成长的纳米级颈，但是没有形成明确的单分子接触，并且传输性能仍然受Nb和Ta支配。

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