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Critical Temperature of Smart Meta-superconducting MgB2

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Abstract

Enhancing the critical temperature (T C ) is important not only to widen the practical applications but also to expand the theories of superconductivity. Inspired by the meta-material structure, we designed a smart meta-superconductor consisting of MgB2 microparticles and Y2O3/Eu3+ nanorods. In the local electric field, Y2O3/Eu3+ nanorods generate an electroluminescence (EL) that can excite MgB2 particles, thereby improving the T C by strengthening the electron–phonon interaction. An MgB2-based superconductor doped with one of four dopants of different EL intensities was prepared by an ex situ process. Results showed that the T C of MgB2 doped with 2 wt% Y2O3, which is not an EL material, is 33.1 K. However, replacing Y2O3 with Y2O3/Eu3+II, which displays a strong EL intensity, can improve the T C by 2.8 to 35.9 K, which is even higher than that of pure MgB2. The significant increment in T C results from the EL exciting effect. Apart from EL intensity, the micromorphology and degree of dispersion of the dopants also affected the T C . This smart meta-superconductor provides a new method to increase T C .

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Acknowledgments

This work was supported by the National Natural Science Foundation of China for Distinguished Young Scholar under Grant No. 50025207.

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Authors and Affiliations

  1. Smart Materials Laboratory, Department of Applied Physics, Northwestern Polytechnical University, Xi’an, 710129, People’s Republic of China

    Shuo Tao, Yongbo Li, Guowei Chen & Xiaopeng Zhao

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  1. Shuo Tao
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  2. Yongbo Li
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  3. Guowei Chen
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  4. Xiaopeng Zhao
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Correspondence to Xiaopeng Zhao.

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Tao, S., Li, Y., Chen, G. et al. Critical Temperature of Smart Meta-superconducting MgB2 . J Supercond Nov Magn 30, 1405–1411 (2017). https://doi.org/10.1007/s10948-016-3963-7

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  • DOI: https://doi.org/10.1007/s10948-016-3963-7

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