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arXiv 0903.3286cond-mat.supr-con
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超导体V3Si(001)的表面重构和能隙

Surface reconstruction and energy gap of superconducting V3Si(001)

N. Hauptmann, M. Becker, J. Kroeger, R. Berndt

摘要:

利用低温扫描隧道显微镜研究了V_3Si(001)表面的一种未知重构,这种重构很可能是由碳引起的,并在原子尺度上研究了准粒子能隙.间隙的宽度在碳杂质处和接近碳杂质处几乎没有改变,在重构的表面晶格的不同位点处也没有改变。然而,在将显微镜的尖端移动到与超导体的受控接触时,引起了间隙的光谱特征的显著修改。由此产生的正常金属-超导体结的光谱表明Andreev反射的存在。

英文摘要:

A yet unknown surface reconstruction of V3Si(001), which is most likely induced by carbon, is used to investigate the quasi-particle energy gap at the atomic scale by a cryogenic scanning tunneling microscope. The width of the gap was virtually not altered at and close to carbon impurities, nor did it change at different sites of the reconstructed surface lattice. A remarkable modification of the spectroscopic signature of the gap was induced, however, upon moving the tip of the microscope into controlled contact with the superconductor. Spectroscopy of the resulting normal-metal -- superconductor junction indicated the presence of Andreev reflections.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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