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Enhanced flux pinning properties in Bi1.6Pb0.4Sr2−xKxCa2Cu3O10+δ compounds

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Abstract

The effect of K substitutions on the structural and superconducting properties of Bi–Pb–Sr–Ca–Cu–O (BPSCCO) system has been investigated. Polycrystalline samples with stoichiometry of Bi1.6Pb0.4Sr2−xKxCa2Cu3O10+δ, where x = (0.00, 0.02, 0.04, 0.06, 0.08, and 0.1), were prepared by using the conventional solid state reaction technique. The X-ray diffraction (XRD) and scanning electron microscopy (SEM) data showed that all samples consisted of high Tc (Bi-2223) and low Tc (Bi-2212) phases, and their volume fractions were found to vary with K content (x). The zero critical temperature was found to decrease from ~ (104.5 to 94.6) K, which was attributed to the decreases in hole carrier concentration. At 65 K, the magnetization critical current density (Jc) of the K-substituted samples was enhanced in comparison with that of the pure one. The Jc enhancement might be attributed to the formation of point defects resulting from the partial substitutions of K into Sr site in the BPSCCO system. In addition, the dominant pinning mechanism was found to be point-like pinning, as described using the Dew-Hughes model.

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Acknowledgements

This research is funded by Vietnam National Foundation for Science and Technology Development (NAFOSTED) under Grant Number 103.02-2016.11. The corresponding author (Duc H. Tran) devotes a part of this success to his wife (Linh Thuy Pham) for celebrating her birthday.

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Authors and Affiliations

  1. Faculty of Physics, VNU University of Science, Hanoi, Vietnam

    Duc H. Tran, An T. Pham, Tien M. Le, Do T. K. Anh & Yen T. Phan

  2. International Training Institute of Material Science, Hanoi University of Science and Technology, Hanoi, Vietnam

    Nguyen K. Man

  3. Department of Physics, Sungkyunkwan University, Suwon, Republic of Korea

    Tien M. Le, Duong Pham & Won-Nam Kang

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  1. Duc H. Tran
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Correspondence to Duc H. Tran.

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Tran, D.H., Pham, A.T., Le, T.M. et al. Enhanced flux pinning properties in Bi1.6Pb0.4Sr2−xKxCa2Cu3O10+δ compounds. J Mater Sci: Mater Electron 30, 8233–8238 (2019). https://doi.org/10.1007/s10854-019-01139-w

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