Resumo

HERNANDEZ-WOLPEZ, M. et al. Magnetic relaxation in (Bi, Pb)-2223 superconducting ceramics doped with α-Al ₂ O ₃ nanoparticles. Rev. mex. fis. [online]. 2020, vol.66, n.1, pp.42-46.  Epub 27-Nov-2020. ISSN 0035-001X.  https://doi.org/10.31349/revmexfis.66.42.

A preliminary study of the magnetic relaxation in (Bi, Pb)-2223 superconducting ceramics doped with ®-Al2O3 nanoparticles is presented, taking as starting point the measurements of the M(t) dependence, both in samples in the form of powder as in pellet. The relaxation of the three types of vortices that can exist inside these materials is analyzed, emphasizing on the intragranular region where the planar defects exist and, consequently, Abrikosov-Josephson vortices emerge. Finally, interesting results of the comparison between the behavior of the samples in the form of powder and in the form of pellet are shown from the estimation of the pinning energy of the vortices.

Palavras-chave : Bi-based cuprates; magnetic relaxation; vortices; doping; planar defects; 74.72.Hs; 74.25.Ha; 74.25.Qt; 74.62.Dh.

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