Suppression of superconductivity in epitaxial NbN ultrathin films

被引：89

作者：

Kang, L. ^{[1
]}

Jin, B. B. ^{[1
]}

Liu, X. Y. ^{[1
]}

Jia, X. Q. ^{[1
]}

Chen, J. ^{[1
]}

Ji, Z. M. ^{[1
]}

Xu, W. W. ^{[1
]}

Wu, P. H. ^{[1
]}

Mi, S. B. ^{[2
]}

Pimenov, A. ^{[3
]}

Wu, Y. J. ^{[4
]}

Wang, B. G. ^{[4
]}

机构：

[1] Nanjing Univ, Res Inst Superconductor Elect RISE, Sch Elect Sci & Engn, Nanjing 210093, Peoples R China

[2] Chinese Acad Sci, Inst Met Res, Solid Atom Imaging Div, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China

[3] Univ Wurzburg, D-97074 Wurzburg, Germany

[4] Nanjing Univ, Dept Phys, Natl Lab Solid State Microstruct, Nanjing 210093, Peoples R China

来源：

JOURNAL OF APPLIED PHYSICS | 2011年 / 109卷 / 03期

关键词：

SURFACE IMPEDANCE; THIN-FILMS; NIOBIUM; TERAHERTZ; RESISTIVITY; MIXERS; LIMIT;

D O I：

10.1063/1.3518037

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

This paper studies the suppression of superconducting transition temperature (T-c) of ultrathin NbN film. We fabricated epitaxial NbN superconducting thin films of thicknesses ranging from 2.5 to 100 nm on single crystal MgO (100) substrates by dc magnetron sputtering. We performed structure analyses and measured their electric and far infrared properties. The experimental results were compared with several mechanisms of the suppression of superconductivity proposed in the literature, including the weak localization effect, the proximity effect, and quantum size effect (electron wave leakage model). We found that the electron wave leakage model matches best to the experimental data. (C) 2011 American Institute of Physics. [doi:10.1063/1.3518037]

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