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Significant enhancement of superconducting performances of Bi-2212 fibers through combined sodium substitution and LFZ process

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Abstract

This paper reports the microstructure, magnetoresistivity, electrical and superconducting properties of Bi-2212 fibers with Na+ ions incorporated into a superconducting matrix prepared by a polymer solution method and additionally textured through the laser floating zone process. XRD patterns showed that Bi-2212 phase is the major one with mostly (00ℓ) diffractions due to the grain alignment, independently of Na content. SEM micrographs showed that samples are composed of well-stacked and oriented grains. The irreversibility field (Hirr), upper critical magnetic field (Hc2), coherence length (ξ), and activation energies (U) have been calculated using magnetoresistivity measurements and explained based on the thermally activated flux flow (TAFF) model. Considering the resistivity-temperature graph for zero field, Tc values tend to increase from 84.8 K (for the pure sample) to 93.2 K (for 0.075Na sample), slightly decreasing for higher content. Besides, transition temperature width (ΔTc = Tconset − Tcoffset) decreases with the increment in the Na content and reaches its minimum value (ΔTc = 3.7 K) in 0.075Na sample. However, broadening of superconducting transition has been observed with applied field and Tc values decreased to 76.1 K for the pure sample and 86.8 K for 0.075Na sample. Likewise, the activation energies of the samples also decreases significantly with the increase of the magnetic field and the activation energies of the Na-containing samples are found to be higher than the pure sample at each magnetic field value. Hc2(0) values are calculated as 33.8, 43.8, 50.1, 33.1, and 21.4 T for 0.0, 0.075, 0.10, and 0.20 T Na samples, respectively. As a consequence, referring to all experimental results and theoretical findings, the superconducting characteristics improve regularly with Na-doping until x = 0.075 due to increment in the interaction of superconducting clusters, decrement in weak-links and stabilization of charge carriers in CuO2 conducting planes.

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Acknowledgements

A. Sotelo and M. A. Madre acknowledge Spanish MINECO-FEDER (Project MAT2017-82183-C3-1-R) and Gobierno de Aragón-FEDER (Research Group T 54-20R) for funding. Authors would like to acknowledge the use of Servicio General de Apoyo a la Investigación-SAI, Universidad de Zaragoza.

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Authors and Affiliations

  1. Department of Physics, Faculty of Sciences and Letters, Çukurova University, 01330, Adana, Turkey

    M. Gürsul, I. Ergin & B. Özçelik

  2. Institute of Engineering and Sciences, Iskenderun Technical University, 31200, Hatay, Turkey

    C. Özçelik & T. Depci

  3. ICMA (CSIC-Universidad de Zaragoza), María de Luna, 50018, Zaragoza, Spain

    M. A. Madre & A. Sotelo

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  1. M. Gürsul
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Gürsul, M., Ergin, I., Özçelik, C. et al. Significant enhancement of superconducting performances of Bi-2212 fibers through combined sodium substitution and LFZ process. J Mater Sci: Mater Electron 32, 17686–17699 (2021). https://doi.org/10.1007/s10854-021-06305-7

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