Bias dependence of W, Mo and Ta conductance histograms

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• 作者：D. den Boer ; O.I. Shklyarevskii ; S. Speller
• 关键词：Break-junction ; Nanocontact ; Conductance ; Bias ; Tungsten ; Molybdenum ; Tantalum
• 刊名：Physica B
• 出版年：2007
• 出版时间：31 May 2007
• 年：2007
• 卷：395
• 期：1-2
• 页码：20-27
• 全文大小：1173 K

文摘

The increase of the bias voltage V_b above 0.4–0.5 V results in the emerging of new peaks in the conductance histograms of W, Mo and Ta. Only for Ta and for some of the Mo contacts these peaks are reproducible and related to stable atomic arrangements. For W the additional peaks are always contact specific. The shape of the conductance histogram at elevated e4386e536a09bb749e7e8bded4a1847"" title=""Click to view the MathML source"">V_b depends also on the bias voltage and is changing in the process of measurements for the majority of Mo contacts. Possible reasons for this non-typical behavior of conductance of molybdenum and tungsten nanocontacts are discussed.