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On the basis of the idea that the injecting energy will improve the conditions for the formation of Cooper pairs, a smart meta-superconductor (SMSC) was prepared by doping luminescent nanocomposite Y 2 O 3 :Eu 3+ /Ag in MgB 2 . To improve the superconducting transition temperature ( T   C  ) of the MgB 2 -based superconductor, two types of Y 2 O 3 :Eu 3+ /Ag, which has the strong luminescence characteristic, with different sizes were prepared and marked as m-Y 2 O 3 :Eu 3+ /Ag and n-Y 2 O 3 :Eu 3+ /Ag. MgB 2  SMSC was prepared through an  ex situ  process. Results show that when the dopant content was fixed at 2.0 wt.%, the  T   C   of MgB 2  SMSC increased initially then decreased with the increase in the Ag content in the dopant. When the Ag content is 5%, the  T   C   of MgB 2  SMSC was 37.2–38.0 K, which was similar to that of pure MgB 2 . Meanwhile, the  T   C   of MgB 2  SMSC doped with n-Y 2 O 3 :Eu 3+ /Ag increased initially then decreased basically with the increase in the content of n-Y 2 O 3 :Eu 3+ /Ag, in which the Ag content is fixed at 5%. The  T   C   of MgB 2  SMSC doped with 0.5 wt.% n-Y 2 O 3 :Eu 3+ /Ag was 37.6–38.4 K, which was 0.4 K higher than that of pure MgB 2 . It is thought that the doping luminescent nanocomposite into the superconductor is a new means to improve the  T   C   of SMSC.

Smart meta-superconductor MgB2 constructed by the dopant phase of luminescent nanocomposite