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YBa2Cu3O7-δ bicrystal grain boundary Tc microstructure

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3 Author(s)
J. A. Luine ; TRW Space & Electron Group, Redondo Beach, CA, USA ; A. M. Klushin ; V. Z. Kresin

We use an SαSβISβ tunneling/proximity-effect model with measured YBa2Cu3 O7-δ (YBCO) grain boundary function (GBJ) normalized critical current temperature dependence η(T)=Ic(T)Ic(O) to infer microstructural transition temperature profiles Tc(x) for bicrystal GBJs with various misorientation angles θ. We discuss the rationale for selecting an optimum value for a numerical analysis parameter ε (associated with the SαSβ interface T c discontinuity). We determine the extent to which inferred T c(x) profiles vary with ±20% rms deviations from nominal values for the fixed input parameters whose a priori values are not precisely known. This sensitivity analysis shows that specified T c locations can be determined with ⩽±1 nm precision for Tc<60 K. Finally, we present new inferred T c(x) profiles for bicrystal junctions with θ=24° and 32° and compare these profiles with those of bicrystal JJs with θ=19° and 36.8° which we previously reported. Our inferred Tc(x) profiles for these functions exhibit a clear correlation with θ: as θ increases so does the extent of the grain boundary region with suppressed Tc. This expected result gives us confidence that our approach should prove useful as a tool for elucidating the structure and properties of high temperature superconductors

Published in:

IEEE Transactions on Applied Superconductivity  (Volume:11 ,  Issue: 1 )