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Titre: | Second-peak effect in a superconducting Tl, Bi -1212 single crystal by ac susceptibility : evidence for vortex plastic behavior |
Auteur(s): | Aouaroun, T. Simon, Ch. |
Mots-clés: | Superconducting Susceptibility Vortex plastic Second-peak |
Date de publication: | 1998 |
Editeur: | American Physical Society |
Collection/Numéro: | Physical Review B/ Vol.58, N°17 (1998); |
Résumé: | A second peak effect is observed for a ~Tl, Bi!-1212 single crystal using ac susceptibility measurements. The
analysis of the frequency dependence of the second peak position shows that plasticity governs the vortex
dynamics on both sides of the second peak line. This suggests that no particular change in the vortex dynamics
occurs by crossing this line. We propose that this second peak effect is due to the temperature activated form
of the characteristic relaxation times and to the fact that the characteristic activation energy Uc and the critical
current density Jc have inverse variations with the magnetic field B ~when one increases with B the other
decreases!. We also propose that the time dependence of the second peak field position should indicate the
vortex dynamics behavior: an increasing second peak field position with time is a fingerprint of elastic behavior
while a decreasing second peak field position with time is a fingerprint of plastic behavior. The latter case
agrees well with our experimental results |
URI/URL: | http://dlibrary.univ-boumerdes.dz:8080/handle/123456789/2686 |
ISSN: | 1098-0121 |
Collection(s) : | Publications Internationales
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