Improved Y-123 Materials by Chemical Substitutions
By using the knowledge accumulated during last decade about the relationship between the structural features and the superconducting properties we have attempted to design an improved Y123 material that would display an increased superconducting transition temperature, Tc, and enhanced critical current, Jc, and irreversibility fields, Birr. Chemical substitutions on various crystallographic sites were made to reduce the buckling of the CuO2-planes. Substitutions of Sr for Ba and transition elements for copper were made to shorten the distance between the double-CuO2-planes while preserving the “metallicity” of the blocking layer. The synthesis and annealing conditions were optimized to obtain the highest Tc. Improved critical currents and irreversibility fields were found for (Nd1−xLax)123 and YBaSrCu3−yMOyO7+d compounds. The existence of these materials indicates that it is possible to further enhance superconducting properties of YBa2Cu3O7 materials by clever design of the crystal chemistry.
KeywordsTransition Element Critical Current Superconducting Property High Oxygen Pressure Chemical Substitution
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