通过电致发光GaP非均匀相在MgB2中实现光学激活超导性
Optically Activated Superconductivity in MgB2 via Electroluminescent GaP Inhomogeneous Phase
AI总结：
研究通过引入电致发光非均匀相调控MgB2超导性能，揭示了界面光-声子-电子协同机制，增强传统声子介导系统的超导性，实现超导临界温度提升和临界电流密度增加。
摘要：
实验结果表明，通过在MgB2中引入电致发光非均匀相，能够有效调控其超导性能，揭示了界面光-声子-电子协同机制，该机制通过增强Mg-B层的E2g声子模与局域光学场和电磁近场的耦合，显著增强电子-声子相互作用。随着非均匀相发射强度的增加，界面光场驱动机制显著增强电子-声子耦合常数λ，导致超导转变温度Tc逐渐升高（最大增强约1.4 K），从而在不改变MgB2主要化学成分的情况下，实现超导配对通道的可调增强。此外，GaP非均匀相的纳米级分散分布预计会诱导细尺度缺陷，这些缺陷作为有效的钉扎中心并促进致密化，使在自场下20 K时临界电流密度增加约69%，Hirr提升约31.5%。这些结果表明，电致发光非均匀相通过两种机制协同增强MgB2的超导性能：'原位近场增强配对'和'结构钉扎辅助磁通优化'，从而为构建可通过内部光学场激活的超导材料系统提供新的设计策略。
英文摘要：
Experimental results demonstrate a viable strategy for tuning the superconducting properties of MgB2 through the incorporation of an electroluminescent inhomogeneous phase, revealing an interfacial light-phonon-electron synergistic mechanism that enhances superconductivity in conventional phonon-mediated systems. By introducing GaP electroluminescent inhomogeneous phases into MgB2 and activating their emission in situ through the application of a bias current during measurements, it is experimentally observed that the localized optical field and electromagnetic near field generated at the interface can effectively couple with the E2g phonon mode of the Mg-B layers, thereby significantly enhancing the electron-phonon interaction. As the emission intensity of the inhomogeneous phase increases, the interface light-field-driven mechanism markedly enhances the electron-phonon coupling constant lambda and leads to a gradual increase in the superconducting transition temperature Tc (with a maximum enhancement of approximately 1.4 K), enabling a tunable enhancement of the superconducting pairing channel in MgB2 without altering its primary chemical composition. In addition, the nanoscale dispersed distribution of the GaP inhomogeneous phase is expected to induce fine-scale defects that act as effective pinning centers and promote densification, resulting in an increase of the critical current density by approximately 69% at 20 K in the self-field and an enhancement of Hirr by about 31.5%. These results indicate that the electroluminescent inhomogeneous phase can synergistically enhance the superconducting performance of MgB2 through two mechanisms: "in situ near-field-enhanced pairing" and "structural pinning-assisted flux optimization", thereby providing a new design strategy for constructing superconducting material systems that can be activated by internal optical fields.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
