https://doi.org/10.1140/epjb/e2005-00025-7
On voltage-current characteristics and critical current in Bi-2212
1
CRISMAT/ENSI-Caen, UMR 6508 du CNRS, 6 Boulevard Maréchal Juin, 14050 Caen, France
2
LEMA-Universit de Tours, UMR CNRS/CEA 6157 - 37000 Tours,
France
3
CEA/DMAT, B.P. 16, Le Ripault, 37260 Monts, France
Corresponding author: a alain.pautrat@ensicaen.fr
Received:
2
July
2004
Revised:
17
November
2004
Published online:
11
February
2005
V(I) characteristics have been performed in a monocrystalline microbridge of Bi[ b]-2212. The vortex phase diagram has been greatly investigated. Linear but non-ohmic Voltage (Current) (V(I)) curves with a well defined critical current have been observed. A departure from this behavior is observed near the peak effect where an out of equilibrium high threshold current can be stabilized. At high temperature, the critical current persists in the “liquid" state despite the dissipation at the lowest bias. Some implications of these results are discussed. In particular, it is proposed that the surface disorder, rather than the bulk disorder, is responsible for the vortex pinning in this sample.
PACS: 74.25.Sv – Critical currents / 74.25.Fy – Transport properties (electric and thermal conductivity, thermoelectric effects, etc.) / 74.72.Hs – Bi-based cuprates
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2005
