Critical Current Density and Meissner Effect of Smart Meta-Superconductor MgB and Bi(Pb)SrCaCuO.

The smart meta-superconductor MgB and Bi(Pb)SrCaCuO increase the superconducting transition temperature (), but the changes in the transport critical current density () and Meissner effect are still unknown. Here, we investigated the and Meissner effect of smart meta-superconductor MgB and Bi(Pb)SrCaCuO. The use of the standard four-probe method shows that YO:Eu and YO:Eu+Ag inhomogeneous phase significantly increase the , and decreases to a minimum value at a higher temperature. The Meissner effect was measured by direct current magnetization. The doping of YO:Eu and YO:Eu+Ag luminescent inhomogeneous phase causes a Meissner effect of MgB and Bi(Pb)SrCaCuO at a higher temperature, while the non-luminescent dopant reduces the temperature at which samples have Meissner effect. The introduction of luminescent inhomogeneous phase in conventional MgB and copper oxide high-temperature Bi(Pb)SrCaCuO superconductor increases the and , and Meissner effect is exerted at higher temperature. Therefore, smart meta-superconductivity is suitable for conventional and copper oxide high-temperature superconductors.