Nanoscopic netted structure of compositional modulation in (Sm0.33Eu0.33Gd0.33)Ba2Cu3O7-δ superconductors

Hu, A.; Hirabayashi, I.; Winter, M.; Koblischka, M. R.; Hartmann, U.; Zhou, H.
February 2005
Applied Physics Letters;2/28/2005, Vol. 86 Issue 9, p092505
Academic Journal
We report a nanoscaled crisscross network in high-quality melt-processed (Sm0.33Eu0.33Gd0.33)Ba2Cu3O7-δ superconductors investigated with atomic force microscopy (AFM) and transmission electron microscopy. In the ten-micrometer scale, such a net was unveiled as a consequence of crossing annular stripes originating from ordering compositional modulation. The AFM topographic images further displayed that this compositional stripe result in a surface modulation with a few-nanometer wavelength and roughness. The forming mechanism of this compositional stripe and its role as strong δTc-type pinning defects were discussed in the context of rare earth/Ba oscillation around the stoichiometric ratio and the spatial fluctuation of local Tc values.


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