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Fabrication and Superconducting Properties of 19-Filamentary Sr0.6K0.4Fe2As2/Ag/Monel Composite Wires and Tapes

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Abstract

Develo** multi-filamentary 122-type iron pnictides with high mechanical strength and large filling factor is essential for promoting engineering application. In this work, we fabricated 19-filamentary Sr0.6K0.4Fe2As2/Ag/Monel composite wires and tapes through employing roller-die drawing. The introduction of Monel outer sheath strongly reinforces the microhardness Hv up to 134–138, which is ~ 3.4 times higher than silver inner matrix of only 36–44. Importantly, multi-filamentary design and extraordinary microhardness of Sr0.6K0.4Fe2As2/Ag/Monel conductors increase their filling factors by a factor of 2–4 times; those are 35.6–36.4% comparing with 8–15% for the present multi-filamentary wires. Through magnetic characterization, the critical current density Jc values of Sr0.6K0.4Fe2As2 wires and tapes are 2.7 × 103 and 4.2 × 103 A/cm2 at 4.2 K and 5 T, respectively. The Jc enhancement in tapes is attributed to high mass density and grain texture in the filaments. Moreover, the magnetic Jc exhibits weak field-dependent in the high-field region even at 20 K.

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Funding

This work was financially supported by the Natural Science Foundation of China (Nos. 51702319 and 51877180), National Key R&D Program of China (No. 2017TFE0301401), and Fujian Natural Science Fund for Distinguished Young Scholars (No. 2020J06018).

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Authors and Affiliations

  1. Laboratory for Superconductivity and Material Applications, College of Physics and Energy, Fujian Normal University, Fuzhou, 350117, China

    Yun **ao, Hao **, **feng Pan, Wenyu Luo, He Lin & Yong Zhao

  2. Fujian Provincial Collaborative Innovation Center for Advanced High-Field Superconducting Materials and Engineering, Fuzhou, 350117, China

    Yun **ao, Hao **, **feng Pan, Wenyu Luo, He Lin & Yong Zhao

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  1. Yun **ao
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  3. **feng Pan
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Correspondence to He Lin.

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**ao, Y., **, H., Pan, X. et al. Fabrication and Superconducting Properties of 19-Filamentary Sr0.6K0.4Fe2As2/Ag/Monel Composite Wires and Tapes. J Supercond Nov Magn 35, 697–703 (2022). https://doi.org/10.1007/s10948-021-06137-w

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