Importance of Magnetoresistivity Properties and Decrement of the Flux Pinning Energy in YBa2Cu3O7-x Bulk Superconductors Doped with Gd Nanoparticles
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Magnetoresistivity performance of the polycrystalline YBa2Cu3-x Gd (x) O7-x (Y123) superconductors is discussed by the change of the flux pinning mechanism using magnetotransport measurements performed in the magnetic field range from 0 to 7 T. The critical transition temperatures, irreversibility fields (mu (0) H (irr)), upper critical fields (mu (0) H (c2)), penetration depths (lambda) and coherence lengths (xi) of the Y123 materials are deduced from the magnetoresistivity curves. Further, activation (flux pinning) energies belonging to the samples are determined from thermally activated flux creep (TAFC) model. The results obtained display that the flux pinning energies reduce with enhancing the applied magnetic field. This may be attributed to the fact that Gd nanoparticles inserted in the Y123 superconducting core lead to exhibit much weaker flux pinning, lesser crystallinity and connectivity between grains as compared to the pure sample due to the presence of stronger pair-breaking mechanism.