Effect of C_4H_6O_5 Adding on the Critical Current Density and Lateral Levitation Force of Bulk MgB_2

We fabricated malic acid (C_4H_6O_5) -added MgB_2 bulks by wet mixing and “Two-step solid state reaction method”. The effects of adding malic acid on T_c , J_c- H behaviour and lateral levitation force ( F_x) features of bulk MgB_2 have been investigated. A systematic decrease in the critical temperature T_c with increasing adding level confirms the substitution of C at the B site of MgB_2 . While the 4 wt