Study on Superior Property of Y_(0.5)Gd_(0.5)BCO Films

The Y_(0.5)Gd_(0.5)BCO film was successfully fabricated by fluorine-reduced MOD method through dissolving Gd(CH_3COO)_3 into the precursor solution.As a result,Y was partially substituted by Gd and all the films have well c-axis orientation.By comparing the superconducting properties,it is found that the Y_(0.5)Gd_(0.5)BCO film has lower critical transition temperature T_c(90.5K) than that of the pure YBCO and GdBCO films.Yet the Y_(0.5)Gd_(0.5)BCO film has the highest critical current density J_c value about 4.87MA/cm~2 at 65K and self-field.In addition, the J_c value of Y_(0.5)Gd_(0.5)BCO film is enhanced significantly as increasing the applied magnetic field.The J_c value of Y_(0.5)Gd_(0.5)BCO film is 1.8 times and 5.1 times of that of the pure GdBCO and YBCO films at 65K and 3T applied field,respectively.Furthermore,the pinning force of the Y_(0.5)Gd_(0.5)BCO film is effectively improved by the elemental substitutions.