ABSTRACT
In this paper, we present studies of room temperature aging and annealing of tunnel junctions with the size of . We observed a noticeable drop of junction normal resistance unusually combined with increase in subgap resistance as a result of aging. Variation in both and are subject to the junction size effect. An effect of aging history on the junction degradation after consequent annealing was discovered. Discussion and interpretation of the observed phenomena are presented in terms of structural ordering and reconstruction in the layer, driven by diffusion flows enhanced due to stress relaxation processes in the Al layer interfacing the layer.
ACKNOWLEDGMENTS
This work was partly supported by the Swedish Research Council under a grant. Authors are thankful to Professor A. V. Lubenchenko for the fruitful discussions. Authors would like to acknowledge Dr. V. Desmaris for reading of the paper and the useful comments.
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