Critical current-voltage scaling of heavy-ion-irradiated and superconductorsA. Ruyter1, V. Hardy2, N. H. Hong1 and L. Ammor1
1 Laboratoire LEMA, UMR 6157 CNRS-CEA, Université F. Rabelais Parc de Grandmont, 37200 Tours, France
2 Laboratoire CRISMAT, CNRS UMR 6508, ENSICAEN 6 Bd du Maréchal Juin, 14050 Caen, France
received 3 June 2004; accepted in final form 21 September 2004
published online 27 October 2004
Current-voltage characteristics were investigated in highly anisotropic , and isotropic single crystals which were irradiated in the direction parallel to the c-axis. In the range of magnetic fields from to (where is the matching field), same scaling functions can be used to describe the transition in those two systems. The field- and sample-independent critical exponents, which were found to be , using , are in a very good agreement with numerical simulations for strongly screened vortex line interactions. Moreover, the obtained scalings are the same despite a large difference in anisotropy.
74.25.Fy - Transport properties (electric and thermal conductivity, thermoelectric effects, etc.).
74.25.Qt - Vortex lattices, flux pinning, flux creep.
74.72.Hs - Bi-based cuprates.
© EDP Sciences 2004