SmBa2Cu3O7-δ, ZnFe2O4, electron paramagnetic resonance, number of spins.


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SmBa2Cu3O7-δ /(ZnFe2O4)x superconducting composites with 0.00 ≤ x ≤ 0.20 wt% were prepared by the usual solid-state reaction method. The prepared samples were investigated using X-ray powder diffraction (XRD) at room temperature and electron paramagnetic resonance (EPR) measurements in the temperature range (100-295 K). It is found that EPR spectra are dominated by an anisotropic Cu2+ EPR pattern. Moreover, the EPR spectral intensity increases as the temperature decrease from room temperature down to 100 K. The number of spins (N) participating in EPR resonance, the activation energy (Ea), the paramagnetic susceptibility (c) and the effective magnetic moment (µeff) are calculated as a function of both nanosized ZnFe2O4 addition and temperature. The results are interpreted in terms of localized Cu2+ ions from non-superconducting impurity phases and confirmed by magnetization-field (M-H) hysteresis measurements.





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