e-Journal of Surface Science and Nanotechnology
Online ISSN : 1348-0391
ISSN-L : 1348-0391
Conference -ISSS-7-
Impact of Surface Conditions on the Superconductivity of Si(111)-(√7 × √3)-In
Shunsuke YoshizawaHowon KimTakuto KawakamiYuki NagaiTomonobu NakayamaXiao HuYukio HasegawaTakashi Uchihashi
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2015 Volume 13 Pages 151-154

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Abstract

We performed low-temperature scanning tunneling microscopy and spectroscopy on Si(111)-(√7 × √3)-In in magnetic fields. Superconducting vortices were observed by mapping zero-bias conductance in an area consisting of flat terraces separated by atomic steps. While vortices in the terrace regions have an isotropic shape with a normal-state core, those at the atomic steps have anisotropic shapes and the superconductivity is only weakly suppressed in the cores. These properties are understood as a crossover from a normal vortex to a Josephson vortex. We conclude that the atomic steps work as Josephson junctions limiting the density of supercurrents. [DOI: 10.1380/ejssnt.2015.151]

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この記事はクリエイティブ・コモンズ [表示 4.0 国際]ライセンスの下に提供されています。
https://creativecommons.org/licenses/by/4.0/deed.ja
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