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Effect of argon sputtering on XPS depth-profiling results of Si/Nb/Si

Demchenko, Iraida N., Melikhov, Yevgen, Syryanyy, Yevgen, Zaytseva, Irina, Konstantynov, Pavlo and Chernyshova, Maryna 2018. Effect of argon sputtering on XPS depth-profiling results of Si/Nb/Si. Journal of Electron Spectroscopy and Related Phenomena 224 , pp. 17-22. 10.1016/j.elspec.2017.09.009

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Ultrathin Si/Nb/Si trilayer is an excellent example of a system for which dimensionality effects, together with other factors like type of a substrate material and growth method, influence strongly its superconducting properties. This study offers some important insights into experimental investigation of density of states of such a system with the aim to identify an electronic structure of the interface as a function of niobium layer thickness. For that, two Si/Nb/Si trilayers with 9.5 and 1.3 nm thick niobium layer buried in amorphous silicon were studied using high-resolution (HR) XPS depth-profile techniques. Strong influence of sputtering was observed, which resulted in severe intermixture of Si and Nb atoms. Nevertheless, a sharp top interface and metallic phase of niobium were detected for the thicker layer sample. On the contrary, a Nb-rich mixed alloy at top interface was observed for the thinner layer sample.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Subjects: Q Science > QC Physics
Publisher: Elsevier
ISSN: 0368-2048
Date of First Compliant Deposit: 1 November 2017
Date of Acceptance: 21 September 2017
Last Modified: 29 Sep 2018 07:50

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