Abstract
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 Y2O3:Eu3+/Ag in MgB2. To improve the superconducting transition temperature (TC) of the MgB2-based superconductor, two types of Y2O3:Eu3+/Ag, which has the strong luminescence characteristic, with different sizes were prepared and marked as m-Y2O3:Eu3+/Ag and n-Y2O3:Eu3+/Ag. MgB2 SMSC was prepared through an ex situ process. Results show that when the dopant content was fixed at 2.0 wt.%, the TC of MgB2 SMSC increased initially then decreased with the increase in the Ag content in the dopant. When the Ag content is 5%, the TC of MgB2 SMSC was 37.2–38.0 K, which was similar to that of pure MgB2. Meanwhile, the TC of MgB2 SMSC doped with n-Y2O3:Eu3+/Ag increased initially then decreased basically with the increase in the content of n-Y2O3:Eu3+/Ag, in which the Ag content is fixed at 5%. The TC of MgB2 SMSC doped with 0.5 wt.% n-Y2O3:Eu3+/Ag was 37.6–38.4 K, which was 0.4 K higher than that of pure MgB2. It is thought that the doping luminescent nanocomposite into the superconductor is a new means to improve the TC of SMSC.
Highlights
Improving the superconducting critical transition temperature of materials is an important scientific and technical problem in condensed matter physics and materials science
The results indicate that the EL intensity of the luminescent micro Y2O3:Eu3+/Ag (m-Y2O3):Eu3+/Ag nanocomposite and nano Y2O3:Eu3+/Ag flakes (n-Y2O3):Eu3+/Ag is remarkably improved primarily due to the composite luminescence of the electroluminescence of Eu3+ centric and the surface plasma-enhanced photoluminescence of Ag
MgB2 of smart meta-superconductor (SMSC) was prepared through an ex situ process to improve the TC of the MgB2-based superconductor on the basis of the idea that the injecting energy will improve the conditions for the formation of Cooper pairs
Summary
The impurity effect of the dopant dominated when the doping concentration increased to a high range, which led to a low TC These results indicate that doping luminescent nanocomposite materials effectively adjusts and improves TC at an appropriate doping concentration. A new kind of commercial MgB2 with a small ΔT of 0.8 K was used, and we obtained a similar conclusion, which further proves the effectiveness of this method
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