Relationship between the TC of smart meta-superconductor Bi(Pb)SrCaCuO and inhomogeneous phase content

TL;DR

This study explores how doping inhomogeneous luminescent phases into Bi(Pb)SrCaCuO superconductors affects their critical temperature, revealing that specific dopants and particle sizes can enhance TC.

Contribution

It demonstrates that luminescent inhomogeneous phase doping and particle size reduction can increase the critical temperature of B(Pb)SrCaCuO superconductors.

Findings

Luminescent dopants Y2O3:Eu3++Ag and Y2O3:Eu3+ increase TC.

Sm3+ dopant decreases TC.

Reducing raw material particle size enhances TC increase.

Abstract

A smart meta-superconductor Bi(Pb)SrCaCuO (B(P)SCCO) may increase the critical transition temperature (TC) of B(P)SCCO by electroluminescence (EL) energy injection of inhomogeneous phases. However, the increase amplitude {\Delta}TC ({\Delta}TC=TC-T(C,pure)) of TC is relatively small. In this study, a smart meta-superconductor B(P)SCCO with different matrix sizes was designed. Three kinds of raw materials with different particle sizes were used, and different series of Y2O3:Sm3+, Y2O3, Y2O3:Eu3+, and Y2O3:Eu3++Ag doped samples and pure B(P)SCCO were prepared. Results indicated that the TC of the Y2O3 or Y2O3:Sm3+ non-luminescent dopant doping sample is lower than that of pure B(P)SCCO. However, the TC of the Y2O3:Eu3++Ag or Y2O3:Eu3+ luminescent inhomogeneous phase doping sample is higher than that of pure B(P)SCCO. With the decrease of the raw material particle size from 30 to 5 {\mu}m, the particle size of the B(P)SCCO superconducting matrix in the prepared samples decreases, and the doping content of the Y2O3:Eu3++Ag or Y2O3:Eu3+ increases from 0.2% to 0.4%. Meanwhile, the increase of the inhomogeneous phase content enhances the {\Delta}TC. When the particle size of raw material is 5 {\mu}m, the doping concentration of the luminescent inhomogeneous phase can be increased to 0.4%. At this time, the zero-resistance temperature and onset transition temperature of the Y2O3:Eu3++Ag doped sample are 4 and 6.3 K higher than those of pure B(P)SCCO, respectively.