Abstract
The smart meta-superconductor MgB2 and Bi(Pb)SrCaCuO increase the superconducting transition temperature (TC), but the changes in the transport critical current density (JC) and Meissner effect are still unknown. Here, we investigated the JC and Meissner effect of smart meta-superconductor MgB2 and Bi(Pb)SrCaCuO. The use of the standard four-probe method shows that Y2O3:Eu3+ and Y2O3:Eu3++Ag inhomogeneous phase significantly increase the JC, and JC decreases to a minimum value at a higher temperature. The Meissner effect was measured by direct current magnetization. The doping of Y2O3:Eu3+ and Y2O3:Eu3++Ag luminescent inhomogeneous phase causes a Meissner effect of MgB2 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 MgB2 and copper oxide high-temperature Bi(Pb)SrCaCuO superconductor increases the TC and JC, and Meissner effect is exerted at higher temperature. Therefore, smart meta-superconductivity is suitable for conventional and copper oxide high-temperature superconductors.
Highlights
Superconductivity has greatly expanded people’s understanding of condensed matter physics and greatly promoted the progress of industrial technology [1,2]
The JC of pure cMgB2 decreases to a minimum value at 36.8 K, and the JC of Y2O3:Eu3+ and Y2O3:Eu3++Ag-doped samples decreases to a minimum value at 37.8 and 38 K, 4
The I–V curves of Bi(Pb)SrCaCuO and MgB2 smart meta-superconductor are measured by a four-probe method, the transport critical current density JC is obtained and the changes in JC are explored, the Meissner effect is studied by direct current (DC) magnetization measurement; the conclusions are as follows: 1. Y2O3:Eu3++Ag luminescent inhomogeneous phase doping increases the JC of cMgB2 by 38% (T = 34 K), while the JC of non-luminescent dopant-doped samples decreases
Summary
Superconductivity has greatly expanded people’s understanding of condensed matter physics and greatly promoted the progress of industrial technology [1,2]. The TC of MgB2 is increased by 1.2 K, and the zero resistance temperature TC,0 and the onset transition temperature TC,on of Bi(Pb)SrCaCuO are increased by 4 and 6.3 K, respectively We believe that this result is due to superconducting particles acting as microelectrodes to excite the EL of the luminescent inhomogeneous phases under the action of an external electric field. Materials 2022, 15, 972 increasing the JC and the JC of the luminescent inhomogeneous phase doped samples decreases to a minimum value at higher temperatures. R–T test indicates that the non-luminescent dopants Y2O3 and Y2O3:Sm3+ doping decreases the TC of B(P)SCCO, while the TC of B(P)SCCO increases with the doping of luminescent inhomogeneous phases Y2O3:Eu3+ and Y2O3:Eu3++Ag. The preparation process and related characterization of samples were described in [43,45]
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