Mgb2-based superconductor with increased critical transition temperature excited by electroluminescence and preparation method thereof

Abstract

The invention relates to an MgB2-based superconductor with increased critical transition temperature through electroluminescent excitation and a preparation method thereof. The critical transition temperature of the MgB2-based superconductor is changed through ectopic doping of Y2O3:Eu<3+> luminous bodies. Two doping agents of different luminous intensity, namely, Y2O3:Eu<3+>I and Y2O3:Eu<3+>II nano-rods, are prepared through a hydrothermal method, and an MgB2-based superconductor doped with Y2O3:Eu<3+> luminous bodies is prepared through an ectopic doping method. The mass fraction of the Y2O3:Eu<3+> luminous bodies is 1% and 2%. As the luminous intensities of the doping agents increase, the Tc value of the MgB2-based superconductor increases constantly. In the absence of an external magnetic field, when the Y2O3:Eu<3+>II luminous body of high luminous intensity is used as the doping agent and the doping concentration is 2%, Tc of the MgB2-based superconductor is 35.9K, which is higher than Tc (35.8K) of pure MgB2.

Description

technical field [0001] The present invention relates to a kind of MgB 2 A base superconductor and a method for preparing the superconductor, the superconductor has excellent characteristics, such as a relatively high critical transition temperature, and is easy to prepare. Background technique [0002] In 2001, Japanese scientists discovered a new type of binary compound superconducting material MgB 2 , whose T c The highest is 39K, which is the highest superconducting transition temperature in the low-temperature superconducting family. This is another major scientific discovery following the discovery of copper oxide high-temperature superconductors. Studies have shown that: MgB 2 It has relatively high critical temperature, low anisotropy, large coherence length, high critical current density and large upper critical magnetic field, double energy gap (larger energy gap), and the current is not affected by grain boundary connectivity Limitation (no need for high textu...

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Problems solved by technology

MgB 2 Although it has many advantages, the low superconducting critical transition temperature limits its application. People hope to increase its superconducting transition temperature through various means, among which chemical doping is one of the most used methods.

However, a large number of research results have shown that many chemical dopants make MgB 2 T of superconductor c decreased because MgB 2 Lattice doping of materials is not easy to achieve

On the other hand, chemical doping will affect physical properties such as electronic structure and lattice constant, which may reduce the phonon frequency and lead to a decrease in the electric-acoustic coupling strength, which may reduce the MgB 2 the T c

In addition, it is also a means to increase the superconducting critical transition temperature by exciting the superconductor with an external light field, but the experimental results are generally unsatisfactory, and the effect is not obvious or the duration of the effect is very short.

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