Effect of doping Ba, Y V, Zn and Sn on BSCCO superconducting ceramics

TLDR: In this paper, the effect of doping on the superconductivity in Bi/sub 2/Pb/sub 0.6/Sr/sr/sub 1/Ca, R/sub x/Cu/sub 3/O/sub /spl delta// (R=Ba,Y,V,Zn,Sn) has been investigated by resistivity, ac susceptibility measurements and x-ray diffraction (XRD) analysis.

Abstract: The effect of doping on the superconductivity in Bi/sub 2/Pb/sub 0.6/Sr/sub 2/Ca/sub 2-x/R/sub x/Cu/sub 3/O/sub /spl delta// (R=Ba,Y,V,Zn,Sn) has been investigated by resistivity, ac susceptibility measurements and x-ray diffraction (XRD) analysis. All the dopants were incorporated in the calcium site with x ranging from 0.00 to 0.10. The temperature dependence of electrical resistance and ac susceptibility measurements was studied for these samples. The nature of the temperature dependence of the resistance curves indicates the presence of a superconducting transition between grains coupled by weak links. From the XRD data, it is observed that the volume percentage of the 2223 phase decreases with the increasing doping concentration. The presence of low T/sub c/ phase is also visible in the real component (/spl chi/'), of the susceptibility data, while the imaginary component (/spl chi/"), shows a shift towards lower temperature in the intergranular coupling peak, T/sub p/, as the dopant concentration increases. All the doping elements do not enhance the T/sub c/ zero but decreases its value from /spl sim/104 K to 88 K, 53 K, 79.6 K, 58 K and 53 K for Ba, Y, V, Zn and Y respectively for x=0.10. Barium doped samples are least affected by compositional variation and the zero resistance values are higher than that of the other doped samples.