Journal of Superconductivity and Novel Magnetism

, Volume 29, Issue 1, pp 179–185 | Cite as

Study of the Irreversibility Line of GdBa 2Cu 3 O 7 δ Added with Nanosized Ferrite CoFe 2 O 4

  • H. BasmaEmail author
  • R. Awad
  • M. Roumié
  • S. Isber
  • S. Marhaba
  • A. I. AbouAly
Original Paper


(CoFe 2 O 4) x GdBa 2Cu 3 O 7−δ superconducting samples were synthesized using a conventional solid-state reaction technique with 0≤x≤0.1 wt%. Characterization of the prepared samples was carried out using X-ray powder diffraction (XRD) and scanning electron microscopy (SEM). The effect of adding CoFe 2 O 4 to the Gd-123 phase, which acts as a flux pinning center, was investigated by measuring the ac magnetic susceptibility at different applied dc magnetic fields. Both the superconducting transition temperature T c and the critical current density J c increased up to x=0.01 wt%, and then, they decreased with further increase in x. The temperature dependence of the irreversibility line was investigated by the logarithmic plot of the irreversibility field H irr versus (1−T irr/T c(0)). This plot shows a crossover at a field of 1000 Oe, indicating 3D to 2D flux creep fluctuations. Furthermore, the H irrT curves are well fitted according to a theoretical model proposed by Matsushita, based on the depinning mechanism caused by thermally activated flux creep.


GdBa 2Cu 3O7−δ Nanoferrite CoFe 2O4 ac magnetic susceptibility Irreversibility line 



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 the American University of Beirut, Beirut, Lebanon.


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Copyright information

© Springer Science+Business Media New York 2015

Authors and Affiliations

  • H. Basma
    • 1
    Email author
  • R. Awad
    • 1
    • 2
  • M. Roumié
    • 3
  • S. Isber
    • 4
  • S. Marhaba
    • 1
  • A. I. AbouAly
    • 2
  1. 1.Physics Department, Faculty of ScienceBeirut Arab University (BAU)BeirutLebanon
  2. 2.Physics Department, Faculty of ScienceAlexandria UniversityAlexandriaEgypt
  3. 3.Accelerator Laboratory, Lebanese Atomic Energy CommissionCNRSBeirutLebanon
  4. 4.Department of PhysicsAmerican University of BeirutBeirutLebanon

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