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Superconductor samples of type (CoFe2O4)xGdBa2Cu3O7-δ (0≤x≤0.1) were synthesized by the conventional solid-state reaction technique, whereas nanosized CoFe2O4 was prepared by co-precipitation method with grain size of about 8.5 nm. The elemental content of the prepared samples was determined using particle induced X-ray emission (PIXE). The temperature dependence of real ( χ) and imaginary ( χ) components of AC magnetic susceptibility (ACMS) at different magnetic field amplitude (3–15 Oe) was investigated. The analysis of the temperature dependence of ACMS was performed using Bean critical state model. The values of the critical current density Jc at T < Tp ( Tp is the inter-granular loss peak temperature) were calculated as a function of magnetic field and nanosized CoFe2O4 content. It was found that the low nanosized CoFe2O4 addition content (x = 0.01) improves the critical current density Jc of Gd-123 superconducting phase. The observed variation of Jc with temperature indicated that the weak links are changed from superconductor– normal metal–superconductor (SNS) for free sample to superconductor–insulator–superconductor (SIS) type of junctions for samples added with nanosized CoFe2O4 of x < 0.01. We also discussed the experimental results in the framework of the critical state model to estimate the effective volume fraction of the grains fg using Cole–Cole plots.


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The effect of nanosized CoFe2O4 addition on the magnetic properties of GdBa2Cu3O7-δ using AC magnetic susceptibility measurements

Show Author's information R. AWADa,b( )N. H. MOHAMMEDaA. I. ABOU ALYaS. ISBERcH. A. MOTAWEHdD. EL-SAID BAKEERdM. ROUMIÉe
Physics Department, Faculty of Science, Alexandria University, Alexandria, Egypt
Physics Department, American University of Beirut, Beirut, Lebanon
Physics Department, Faculty of Science, Damanhur University, Damanhur, Egypt
Accelerator Laboratory, Lebanese Atomic Energy Commission, Beirut, Lebanon
Physics Department, Faculty of Science, Beirut Arab University, Lebanon

Abstract

Superconductor samples of type (CoFe2O4)xGdBa2Cu3O7-δ (0≤x≤0.1) were synthesized by the conventional solid-state reaction technique, whereas nanosized CoFe2O4 was prepared by co-precipitation method with grain size of about 8.5 nm. The elemental content of the prepared samples was determined using particle induced X-ray emission (PIXE). The temperature dependence of real ( χ) and imaginary ( χ) components of AC magnetic susceptibility (ACMS) at different magnetic field amplitude (3–15 Oe) was investigated. The analysis of the temperature dependence of ACMS was performed using Bean critical state model. The values of the critical current density Jc at T < Tp ( Tp is the inter-granular loss peak temperature) were calculated as a function of magnetic field and nanosized CoFe2O4 content. It was found that the low nanosized CoFe2O4 addition content (x = 0.01) improves the critical current density Jc of Gd-123 superconducting phase. The observed variation of Jc with temperature indicated that the weak links are changed from superconductor– normal metal–superconductor (SNS) for free sample to superconductor–insulator–superconductor (SIS) type of junctions for samples added with nanosized CoFe2O4 of x < 0.01. We also discussed the experimental results in the framework of the critical state model to estimate the effective volume fraction of the grains fg using Cole–Cole plots.

Keywords:

Gd-123 phase, nanosized CoFe2O4, AC magnetic susceptibility (ACMS), critical current density, particle induced X-ray emission (PIXE)
Received: 28 September 2015 Accepted: 03 December 2015 Published: 31 March 2016 Issue date: June 2021
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Publication history

Received: 28 September 2015
Accepted: 03 December 2015
Published: 31 March 2016
Issue date: June 2021

Copyright

© The author(s) 2016

Acknowledgements

This work was performed in the Superconductivity and Metallic-Glass Lab, Physics Department, Faculty of Science, Alexandria University, Alexandria, Egypt, in cooperation with the Accelerator Laboratory, Lebanese Atomic Energy Commission, CNRS, Beirut, Lebanon, and the American University of Beirut, Beirut, Lebanon.

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