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The influence of aging and annealing on the properties of Nb/Al-AlOx/Nb tunnel junctions

Dimitar Dochev (Institutionen för radio- och rymdvetenskap, Avancerad mottagarutveckling) ; Alexey Pavolotsky (Institutionen för radio- och rymdvetenskap, Avancerad mottagarutveckling) ; Zonghe Lai (Institutionen för mikroteknologi och nanovetenskap, Nanotekniklaboratoriet) ; Victor Belitsky (Institutionen för radio- och rymdvetenskap, Avancerad mottagarutveckling)
Journal of Physics: Conference Series. 9th European Conference on Applied Superconductivity (EUCAS). Dresden, GERMANY. SEP 13-17, 2009 (1742-6588). Vol. 234 (2010), 4,
[Konferensbidrag, refereegranskat]

This paper presents results of our studies on aging and annealing properties of Nb/Al-AlOx/Nb junctions. We performed a long room temperature aging with subsequent annealing at different temperatures up to 250°C. A distinct change of the junctions' normal-state resistance has been observed. Aging at room temperature results in a slight decrease of the normal-state resistance combined with improved junction quality, characterised by a better subgap-to-normal resistance ratio. Annealing at moderate temperatures in air increases the normal-state resistance and leads to improvement of the junction quality followed by degradation at higher annealing temperatures. The increase in the junction quality after long-term aging at room temperature is attributed to relaxation of the internal junction structure and interfaces, thus, resulting in a lower density of interface traps. The deterioration at higher annealing temperatures could be a consequence of diffusion processes at the Al/Nb interface. We observe a sufficiently clear difference between the behaviour of preliminary aged and newly fabricated junctions after annealing: for the aged high-quality junction, the degradation was negligible up to temperatures of 200°C, while non-aged junctions show a much faster and abrupt degradation at lower annealing temperatures.

Article Number: 042006

Denna post skapades 2010-07-23. Senast ändrad 2014-09-02.
CPL Pubid: 123937


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Institutioner (Chalmers)

Institutionen för radio- och rymdvetenskap, Avancerad mottagarutveckling (2005-2010)
Institutionen för mikroteknologi och nanovetenskap, Nanotekniklaboratoriet


Den kondenserade materiens fysik
Elektroteknik och elektronik

Chalmers infrastruktur