Journal of Superconductivity and Novel Magnetism

, Volume 28, Issue 10, pp 3001–3010 | Cite as

Excess Conductivity Study in Nano-CoFe2O4-Added YBa2Cu3O7−d and Y3Ba5Cu8O18±x Superconductors

  • Y. Slimani
  • E. Hannachi
  • M. K. Ben Salem
  • A. Hamrita
  • M. Ben SalemEmail author
  • F. Ben Azzouz
Original Paper


We report electrical conductivity fluctuation analyses on YBa2Cu3O7−d (noted Y-123) and Y3Ba5Cu8O18±x (noted Y-358) polycrystalline samples added with nano-sized ferrite cobalt (CoFe2O4) particles. Phases and microstructure have been systematically investigated using X-ray diffraction (XRD) and scanning electron microscopy (SEM). XRD results reveal that the lattice parameters change for both Y-123 and Y-358 phases. SEM observations show that the grain size is reduced with increasing the content of CoFe2O4 in the yttrium-based superconductor (YBCO) matrix The temperature dependence of electrical resistivity ρ(T) has been measured and the effect of addition of magnetic CoFe2O4 in the paraconductivity region has been reported. The thermodynamic fluctuation is obtained by analyzing the excess of conductivity on the basis of the Aslamazov–Larkin theory. The coherence length, the effective layer thickness, critical magnetic fields, and critical current density are estimated. Superconducting parameters are affected by the nanoparticle addition, and results are discussed in relevance to the structural and microstructure differences between Y-123 and Y-358.


High-Tc superconductivity Nano-CoFe2O4 Excess conductivity Critical superconducting parameters 


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Copyright information

© Springer Science+Business Media New York 2015

Authors and Affiliations

  • Y. Slimani
    • 1
  • E. Hannachi
    • 1
  • M. K. Ben Salem
    • 1
  • A. Hamrita
    • 1
  • M. Ben Salem
    • 1
    Email author
  • F. Ben Azzouz
    • 1
    • 2
  1. 1.Laboratory of Physics of Materials - Structure and Properties, Department of Physics, Faculty of Sciences of BizerteUniversity of CarthageZarzounaTunisia
  2. 2.College of Sciences-Girls, Department of PhysicsUniversity of DammamDammamSaudi Arabia

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