Green-Light GaN p-n Junction Luminescent Particles Enhance the Superconducting Properties of B(P)SCCO Smart Meta-Superconductors (SMSCs)

Abstract

Superconducting materials exhibit unique physical properties and have great scientific value and vast industrial application prospects. However, due to limitations, such as the critical temperature (TC) and critical current density (JC), the large-scale application of superconducting materials remains challenging. Chemical doping has been a commonly used method to enhance the superconductivity of B(P)SCCO. However, satisfactory enhancement results have been difficult to achieve. In this study, we introduce green-light GaN p-n junction particles as inhomogeneous phases into B(P)SCCO polycrystalline particles to form a smart meta-superconductor (SMSC) structure. Based on the electroluminescence properties of the p-n junction, the Cooper pairs were stimulated and strengthened to enhance the superconductivity of B(P)SCCO. The experimental results demonstrate that the introduction of inhomogeneous phases can indeed enhance the critical temperature TC, critical current density JC, and complete diamagnetism (Meissner effect) of B(P)SCCO superconductors. Moreover, when the particle size of the raw material of B(P)SCCO is reduced from 30 to 5 μm, the grain size of the sintered samples also decreases, and the optimal doping concentration of the inhomogeneous phases increases from 0.15 wt.% to 0.2 wt.%, further improving the superconductivity.

AC Magnetic Susceptibility: Mathematical Modeling and Experimental Realization on Poly-Crystalline and Single-Crystalline High-Tc Superconductors YBa2Cu3O7−δ and Bi2−xPbxSr2Ca2Cu3O10+y

“…Poly-crystalline Bi C/min) for 24 h and then left to cool down to room temperature. This process preserves the desired Pb and O contents, x ≈ 0.4 and δ ≈ 0.8, respectively, which relate to the maximum critical temperature T c ≈ 110 K [35][36][37][38][39].…”

The Influence of Electroluminescent Inhomogeneous Phase Addition on Enhancing MgB2 Superconducting Performance and Magnetic Flux Pinning

“…Inspired by these ideas, our group proposed combining doping with electroluminescence (EL) excitation, i.e., adding EL materials into superconducting materials to form composite structures, which may be an effective method to enhance the T C of superconductors. We have developed a novel type of smart meta-superconductors (SMSCs), where traditional superconducting materials serve as the matrix, and electroluminescent inhomogeneous phase particles act as the building blocks [13][14][15][16][17][18][19][20][21]. In this model, the inhomogeneous phase is used to inject energy through its EL under external fields to strengthen Cooper pairs, thereby altering T C .…”

“…However, limited by the low electroluminescence intensity and short luminescence lifetime of rare earth oxides, the improvement in superconducting performance remained less than ideal [13][14][15][16][17][18]. Therefore, we also introduced red AlGaInP p-n junction particles as inhomogeneous phases into the MgB 2 matrix [20], GaN p-n junction particles into BSCCO superconductor materials as inhomogeneous phases [21], and GaN p-n junction particles into the MgB 2 matrix as inhomogeneous phases [22], all of which further improved the performance. Compared with Y 2 O 3 :Eu 3+ + Ag electroluminescent materials, p-n junction particles, due to their structural stability, high luminescence intensity, and activation at low voltage, can effectively enhance the critical temperature (T C ), critical current density (J C ), and Meissner effect of MgB 2 superconductors.…”