Enhanced superconducting properties of the Pb doped trilayer high-temperature (Bi2Sr2Can-1CunO2n+4) cuprate superconductor

摘要

A ceramic superconductor compounds with the composition Bi2Sr2Can-1CunO2n+4δwere prepared by solid state reaction from the principle routs like Bi-2212,Ca2CO3and CuO with high purity of 99.99%. Different measurement such as resistivity measurement, X-ray diffraction (XRD) and scanning electron microscope (SEM) were made to show the improvement in the superconductivity of the high phase. The lattice constants are obtained for undoped and Pb doped samples with different values of n. The critical temperatures (Tc) of the high temperature superconducting cuprate (HTSC) Bi2Sr2Can-1CunO2n+4δwere obtained to be Tc =108K for the undoped sample and equal to 133, 115, 147 and 127K for n=3, n=3.5, n=4 and n=4.5 Pb doped systems, respectively.