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Journal of Advanced Ceramics

Keywords

Gd-123 phase, nanosized CoFe2O4, AC magnetic susceptibility (ACMS), critical current density, particle induced X-ray emission (PIXE)

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 2O4 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.

Publisher

Tsinghua University Press

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