In this study, the effect of Ce doping on the properties of Bi 2 Sr 2 Ca 1−x Ce x Cu 2 O 8+δ ceramic superconductors, with x = 0.0, 0.01, 0.05, 0.1, and 0.25, has been investigated.Samples' precursors were prepared using the conventional solid state method and subsequently textured using the Laser Floating Zone technique. The magnetoresistance measurements were studied under various applied magnetic fields. The activation energies, irreversibility fields (H irr ), upper critical fields (H c2 ) and coherence lengths at 0 K (ξ(0)) were calculated from the resistivity versus temperature (ρ-T ) curves, under DC magnetic fields up to 5 T. The thermally activated flux flow model has been applied in order to calculate the flux pinning energies. The results indicated that H c2 (0) varied from 416.19 to 115 T and the flux pinning energies varied from 1.46 to 0.042 eV at 0 T.
In this study, Bi 2 Sr 2 Ca 1-x Ce x Cu 2 O y , where x = 0, 0.01, 0.05, 0.1 and 0.25, superconducting samples were prepared by solid state method and subsequently used as feed in a directional solidification process. The physical properties of the samples were investigated by powder X-ray diffraction, scanning electron microscopy (SEM), dcelectrical resistance, magnetization, and magnetic-hysteresis loops measurements. It has been found that no significant difference has been observed in the critical transition temperatures of samples except for the sample with the highest Ce additions, which shows the lowest T c compared with the other doped samples. Magnetic hysteresis measurements have shown that the hysteresis loop is greater than the doped samples. In addition, critical current density values obtained from the hysteresis loops measurements by using Bean's critical state model show a decrease with Ce-addition. All the results indicate that Cerium substitution for Ca produces the deterioration on the superconducting properties, compared with the undoped sample.
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