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The Effect of Inhomogeneous Phase on the Critical Temperature of Smart Meta-superconductor MgB2

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Abstract

The critical temperature (TC) of MgB2, one of the key factors limiting its application, is highly desired to be improved. On the basis of the meta-material structure, we prepared a smart meta-superconductor structure consisting of MgB2 micro-particles and inhomogeneous phases by an ex situ process. The effect of inhomogeneous phase on the TC of smart meta-superconductor MgB2 was investigated. Results showed that the onset temperature (\(T_{\mathrm {C}}^{\text {on}}\)) of doping samples was lower than those of pure MgB2. However, the offset temperature (\({T}_{\mathrm {C}}^{\text {off}}\)) of the sample doped with Y2O3:Eu3+ nanosheets with a thickness of 2 ∼ 3 nm which is much less than the coherence length of MgB2 is 1.2 K higher than that of pure MgB2. The effect of the applied electric field on the TC of the sample was also studied. Results indicated that with the increase of current, \({T}_{\mathrm {C}}^{\text {on}}\) is slightly increased in the samples doping with different inhomogeneous phases. With increasing current, the \({T}_{\mathrm {C}}^{\text {off}}\) of the samples doped with nonluminous inhomogeneous phases was decreased. However, the \({T}_{\mathrm {C}}^{\text {off}}\) of the luminescent inhomogeneous phase doping samples increased and then decreased with increasing current.

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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

    Honggang Chen, Yongbo Li, Guowei Chen, Longxuan Xu & Xiaopeng Zhao

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  1. Honggang Chen
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  2. Yongbo Li
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  3. Guowei Chen
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  4. Longxuan Xu
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  5. Xiaopeng Zhao
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Correspondence to Xiaopeng Zhao.

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Chen, H., Li, Y., Chen, G. et al. The Effect of Inhomogeneous Phase on the Critical Temperature of Smart Meta-superconductor MgB2. J Supercond Nov Magn 31, 3175–3182 (2018). https://doi.org/10.1007/s10948-018-4599-6

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  • DOI: https://doi.org/10.1007/s10948-018-4599-6

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