Plastic vortex creep above the second magnetization peak in Bi2Sr2CaCu2O8+delta single crystals

Citation
L. Miu et al., Plastic vortex creep above the second magnetization peak in Bi2Sr2CaCu2O8+delta single crystals, PHYSICA C, 334(1-2), 2000, pp. 1-6
Citations number
32
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
PHYSICA C
ISSN journal
09214534 → ACNP
Volume
334
Issue
1-2
Year of publication
2000
Pages
1 - 6
Database
ISI
SICI code
0921-4534(20000601)334:1-2<1:PVCATS>2.0.ZU;2-A
Abstract
The analysis of the activation energy in the magnetization relaxation of Bi 2Sr2CaCu2O8 + delta (BSCCO) single crystals reveals plastic vortex creep ab ove the second magnetization peak (SMP). Above the peak field, the magnetic field dependence of the activation energy U(B) is very close to the form U (B) alpha B-1/2 and the intrinsic variation of U with the current density i s weak. The existence of a crossover from elastic to plastic vortex creep a cross the SMP of high-temperature superconductors (HTSC) seems to be a gene ral behavior, and may have important consequences on the nature of the ther mally induced vortex solid-vortex fluid transition at high magnetic fields. (C) 2000 Elsevier Science B.V. All rights reserved.