Physics – Condensed Matter – Superconductivity
Scientific paper
2007-06-28
Supercond. Sci. Technol. 21, 015013 (2008)
Physics
Condensed Matter
Superconductivity
Scientific paper
10.1088/0953-2048/21/01/015013
Within the context of superconducting gap engineering, Al-\alox-Al tunnel junctions have been used to study the variation in superconducting gap, $\Delta$, with film thickness. Films of thickness 5, 7, 10 and 30 nm were used to form the small area superconductor-insulator-superconductor (SIS) tunnel junctions. In agreement with previous measurements we have observed an increase in the superconducting energy gap of aluminium with a decrease in film thickness. In addition, we find grain size in small area films with thickness \textbf{$\geq$} 10 nm has no appreciable effect on energy gap. Finally, we utilize 7 and 30 nm films in a single Cooper-pair transistor, and observe the modification of the finite bias transport processes due to the engineered gap profile.
Clark Robert G.
Court N. A.
Ferguson Andrew J.
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