Abstract
We have investigated the superconducting properties of the Bi1.7 Pb0.3Sr2Ca2−xCe x Cu3O10+δ system with x=0.00, 0.02, 0.04, 0.08 and 0.1 by X-ray diffraction and magnetic susceptibility. The substitution of Ce for Ca has been found to drastically change the superconducting properties of the system. X-ray diffraction studies on these compounds indicate decrease in the c-parameter with increased substitution of Ce at Ca site and volume fraction of high T c (2 : 2 : 2 : 3) phase decreases and low T c phase increases. The magnetic susceptibility of this compound shows that the diamagnetic on set superconducting transition temperature (onset) varies from 109 K to 51 K for x=0.00, 0.02, 0.04, 0.08 and 0.1. These results suggest the possible existence of Ce in a tetravalent state rather than a trivalent state in this system; that is, Ca2+ → Ce4+ replacement changes the hole carrier concentration. Hole filling is the cause of lowering T c of the system.
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Kothawale, R., Dole, B. & Shah, S. Effect of substitution of Ce on superconducting properties of Bi1.7Pb0.3Sr2Ca2−x Ce x Cu3O10+δ system. Pramana - J Phys 58, 871–875 (2002). https://doi.org/10.1007/s12043-002-0185-2
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DOI: https://doi.org/10.1007/s12043-002-0185-2