  Increasing and improving the critical transition temperature (Tc), current
density (Jc) and Meissner effect (Hc) of conventional superconductors are the
most important problems in superconductivity research, but progress has been
slow for many years. In this study, by introducing the p-n junction
electroluminescent inhomogeneous phase with red wavelength to realize energy
injection, we found the improved property of smart meta-superconductors MgB2,
the critical transition temperature Tc increases by 0.8K, the current density
Jc increases by 37%, and the diamagnetism of Meissner effect Hc also
significantly improved, compared with pure MgB2. Compared with previous yttrium
oxide inhomogeneous phase, p-n junction has higher luminescence intensity,
longer stable life and simpler external field requirements. The coupling
between superconducting electrons and surface plasmon polaritons may be explain
this phenomenon. The realization of smart meta-superconductor by this
electroluminescent inhomogeneous phase provides a new way to improve the
performance of superconductors.
