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Effects of oxygen content on YBCO Josephson junction structures

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4 Author(s)
Sydow, J.P. ; Cornell Univ., Ithaca, NY, USA ; Berninger, M. ; Buhrman, R.A. ; Moeckly, B.H.

The high degree of crystal stress and strain present at, and in the vicinity of, high angle grain boundary (GBJ), ramp edge Co doped SNS (Co-SNS), or interface engineered junctions (IEJ) can lead to localized and highly non-uniform regions of basal plane oxygen loss in YBa/sub 2/Cu/sub 3/O/sub 7-/spl delta// (YBCO). These oxygen inhomogeneities will, to a greater or lesser degree, affect or cause the superconducting weak link behaviour demonstrated by these types of junctions. In order to examine the impact of the localized oxygen micro/nanostructure on the weak link behaviour of these three junction technologies, we have utilized ozone anneals to provide a partial pressure of atomic oxygen far in excess of that produced by standard O/sub 2/ anneals.

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Applied Superconductivity, IEEE Transactions on  (Volume:9 ,  Issue: 2 )