Superconductivity of nanometer-size Pb islands studied by low-temperature scanning tunneling microscopy
Superconductivity of nanometer-size Pb islands studied by low-temperature scanning tunneling microscopy
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DOI：
10.1063/1.2184758
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发表时间：
2006-03
影响因子：
4
通讯作者：
T. Nishio;M. Ono;T. Eguchi;H. Sakata;Y. Hasegawa
中科院分区：
文献类型：
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作者：
T. Nishio;M. Ono;T. Eguchi;H. Sakata;Y. Hasegawa
使用低温（1.2K）扫描隧道显微镜，在 Pb 岛结构上拍摄了显示超导间隙的隧道光谱，其尺寸范围为直径 80 至 300 nm，厚度为 7-12 个单层。无论测量点的局部几何形状（中心或外围）和厚度如何，在单个岛屿上获取的隧道光谱没有显着的空间变化。超导能隙随着岛尺寸的增加而增加，并且尺寸依赖性在较高温度（3.9K）下增强。通过考虑小岛的超导涨落，可以定性地解释间隙的行为。
Using a low-temperature (1.2K) scanning tunneling microscopy, the tunneling spectra showing the superconducting gap was taken on Pb island structures, whose dimension ranges from 80 to 300nm in diameter and 7–12 monolayers in thickness. There is no considerable spatial variation in the tunneling spectra taken on a single island regardless of local geometry (center or peripheral) and thickness of the measured sites. The superconducting gap increases with the island size, and the size dependence is enhanced at higher temperature (3.9K). The behavior of the gap is explained qualitatively by considering the superconducting fluctuation in the small islands.