SUPERCONDUCTIVITY IN (BI,PB)(2)CA2SR2CU3-XVXOY

The superconducting properties of V-doped (Bi,Pb)(2)Sr2Ca2Cu3Oy (2223) samples have been investigated by means of X-ray diffraction and elec trical resistivity measurements. The volume fraction of the 2223 phase decreases with a decrease in the c lattice parameter. The onset of su perconductivity in the samples remains almost constant while the tempe rature at which the resistivity becomes zero decreases with increasing dopant content. The electrical resistivity data suggest that the subs titution of copper by vanadium suppresses the superconductivity in (Bi ,Pb)(2)Sr2Ca2Cu3-xVxOy by destroying the phase coherence and by pair-b reaking effects. The suppression of superconductivity in the system co uld also be due to a decrease in the carrier concentration.