Preparation of 107K Superconducting Thin Film in Bi-Sr-Ca-Cu-O System by Coevaporation
Thin films of Bi2.0(Sr1 -xCax)3.3Cu2.3Oy system were prepared on (100)MgO substrates by coevaporation of Bi2O3, Sr-Ca alloy and Cu metal, and effects of film composition and annealing condition on superconducting properties were investigated. High-Tc phase was formed for the films with relatively high Ca composition and with post-deposition annealing at high temperature. The superconducting transition temperatures of both low-Tc phase and high-Tc phase decreased with increasing Ca composition. And the films with x = 0.51 showed the highest superconducting transition temperature of 107K.
KeywordsMutual Solubility Annealed Film Formation Range Ideal Chemical Composition High Superconducting Transition Temperature
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