Exploiting the mechanically controllable break junction technique, we have measured the conductance of atom-sized contacts of Fe, Co, and Ni at room temperature under ultrahigh vacuum conditions. The conductance histogram of Fe exhibits a broad peak around 2.5 G[0] (G[0] ≡ 2e[2]/h), whereas those of Co and Ni show no conductance peaks. However, the histograms of Co and Ni display different structures: While the Co histogram is simply flat, the Ni histogram reveals an appreciable background. Our experimental results are compared with previous results obtained at cryogenic and room temperatures, and the observed peak missing in our room-temperature histograms of Co and Ni is discussed.
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机译：利用机械可控的断开连接技术，我们已经测量了室温下超高真空条件下Fe，Co和Ni原子级触点的电导率。 Fe的电导直方图在2.5 G [0]（G [0]≡2e [2] / h）附近显示一个宽峰，而Co和Ni的电导直方图没有电导峰。但是，Co和Ni的直方图显示了不同的结构：尽管Co直方图只是平坦的，但Ni直方图却显示出可观的背景。将我们的实验结果与在低温和室温下获得的先前结果进行比较，并讨论了在我们的室温Co和Ni直方图中观察到的峰缺失。
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