Bi_2(Sr_<0.6>Ca_<0.4>)_3(Cu_<1-x>M_x)_2O_<8+y>(M=Fe,Co,Ni,Zn)の超伝導特性

Electrical resistivity and magnetic susceptibility of superconducting Bi_2(Sr_<0.6>Ca_<0.4>)_3 (Cu_<l-x>M_x)_20<8+y> (M=Fe, Co, Ni, Zn) system have been measured in the temperature range from 4.2 to 300 K. The substitution of 3d transition elements for Cu element shows that the superconducting transition temperature T_c decreases smoothly with increasing the concentration x of 3d transition elements, and that the decreasing rate of T_c vs x decreases with increasing the atomic number of 3d transition elements. The effects of magnetic monents of Fe , Co and Ni elements on the superconductivity are not notable.