Improving the critical transition temperature (T C ) of Bi(Pb)SrCaCuO (B(P)SCCO) high-temperature superconductors is important, however, considerable challenges exist. In this study, we designed a smart meta-superconductor B(P)SCCO consisting of B(P)SCCO microparticles and Y 2 O 3 :Eu 3+ +Ag topological luminophor based on a metamaterial structure and the idea that the injecting energy will promote the formation of Cooper pairs. In the applied electric field, the Y 2 O 3 :Eu 3+ +Ag topological luminophor generates an electroluminescence (EL), thereby promoting the T C via EL energy injection. A series of Y 2 O 3 :Eu 3+ +Ag topological luminophor-doped B(P)SCCO samples was prepared. Results showed that Y 2 O 3 :Eu 3+ +Ag was dispersed around B(P)SCCO particles, forming a metastructure. Accordingly, the onset temperature (π πΆ,ππ ) and zero resistance transition temperature (π πΆ,0 ) of B(P)SCCO increased. The 0.1 wt% Y 2 O 3 :Eu 3+ +Ag doping B(P)SCCO sample exhibited a large increase, and π πΆ,0 and π πΆ,ππ were increased by 13 K and 4 K, respectively. The B(P)SCCO sample doped with 0.2 wt% Y 2 O 3 or Y 2 O 3 :Sm 3+ nonluminous inhomogeneous phase was also prepared to further prove the influence of EL on the π πΆ,0 and π πΆ,ππ rather than the rare earth effect. Results indicated that the π πΆ,ππ of the Y 2 O 3 or Y 2 O 3 :Sm 3+ doping sample decreased, and the π πΆ,0 slightly increased. However, the π πΆ,0 and π πΆ,ππ of the 0.2 wt% Y 2 O 3 :Eu 3+ +Ag topological luminophor-doped sample improved by 8 K and 4 K, respectively. This outcome further demonstrated that the smart metastructure method can improve the T C of B(P)SCCO.
Incorporating with inhomogeneous phases with high electroluminescence (EL) intensity to prepare smart meta-superconductors (SMSCs) is an effective method for increasing the superconducting transition temperature (Tc) and has been confirmed in both MgB2 and Bi(Pb)SrCaCuO systems. However, the increase of ΞTc (ΞTc = Tc β Tcpure) has been quite small because of the low optimal concentrations of inhomogeneous phases. In this work, three kinds of MgB2 raw materials, namely, aMgB2, bMgB2, and cMgB2, were prepared with particle sizes decreasing in order. Inhomogeneous phases, Y2O3:Eu3+ and Y2O3:Eu3+/Ag, were also prepared and doped into MgB2 to study the influence of doping concentration on the ΞTc of MgB2 with different particle sizes. Results show that reducing the MgB2 particle size increases the optimal doping concentration of inhomogeneous phases, thereby increasing ΞTc. The optimal doping concentrations for aMgB2, bMgB2, and cMgB2 are 0.5%, 0.8%, and 1.2%, respectively. The corresponding ΞTc values are 0.4, 0.9, and 1.2 K, respectively. This work open a new approach to reinforcing increase of ΞTc in MgB2 SMSCs.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citationsβcitations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.