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Investigation of Temperature Dependence of the Irreversibility Line of GdBa 2 Cu 3 O7−δ Added with Nanosized Ferrite ZnFe 2 O 4

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Abstract

Superconducting samples of the type (ZnFe2O4) x GdBa2Cu3O7−δ were synthesized by the conventional solid-state reaction technique. The nanosized (ZnFe2O4) content x varied from 0 to 0.1 wt% of the samples’ total mass. The prepared samples were characterized using X-ray powder diffraction (XRD) and scanning and transmission electron microscopes (SEM and TEM). The effect of ZnFe2O4 addition, which acts as flux pinning centers, was investigated using ac magnetization at different applied dc magnetic fields. It was found that addition of the nanosized (ZnFe2O4) up to 0.06 wt% enhances the critical current density J c and the superconducting transition temperature T c. On the other hand, the superconducting properties of these samples are deteriorated for x > 0.06 wt%. The irreversibility line was thermally activated. The logarithmic plot of H irr versus (1 − T irr/ T c(0)) shows a crossover at about 500 Oe, reflecting the transition from two- to three-dimensional vortex fluctuations. The B irr–T curves are well fitted according to Matsushita’s model, which is based on the de-pinning mechanism caused by thermally activated flux creep.

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Acknowledgments

This work was performed in the superconductivity and metallic-glass lab, Faculty of Science, Alexandria University, EGYPT and in Collaboration with SI, Physics Department at American University of Beirut, Beirut, Lebanon.

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Authors and Affiliations

  1. Physics Department, Faculty of Science, Beirut Arab University (BAU), Beirut, Lebanon

    R. Awad, S. Marhaba & H. Basma

  2. Physics Department, Faculty of Science, Alexandria University, Alexandria, Egypt

    R. Awad & A. I. AbouAly

  3. Accelerator Laboratory, Lebanese Atomic Energy Commission, CNRS, Beirut, Lebanon

    M. Roumié

  4. Department of Physics, American University of Beirut, PO Box 11-0236, Beirut, Lebanon

    S. Isber

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  1. R. Awad
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  2. M. Roumié
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Correspondence to H. Basma.

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Awad, R., Roumié, M., Isber, S. et al. Investigation of Temperature Dependence of the Irreversibility Line of GdBa 2 Cu 3 O7−δ Added with Nanosized Ferrite ZnFe 2 O 4 . J Supercond Nov Magn 28, 535–539 (2015). https://doi.org/10.1007/s10948-014-2752-4

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  • DOI: https://doi.org/10.1007/s10948-014-2752-4

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