摘要
Ⅰ. INTRODUCTIONX. D. Xiang et al. have reported the preliminary structural characteristics of the iodine intercalated Bi_2Sr_2Ca_1Cu_2O_y high T_c superconductors. The cell dimension along c direction is expanded from 30.80 to 37.78 after iodine is intercalated. They suggested that an iodinelayer addition with 3.5 thickness is inserted into the host crystal perpendicular to c direction. The transition temperature of the host superconductor is ranged from 82 to 90 K.
