Journal of magnetism and magnetic materials vol:90-1 pages:647-648
date:MOSCOW CHEM ENGN RES INST,MOSCOW 125820,USSR
A magnetization relaxation has been observed in Bi2Sr2Ca1Cu2O(x) single crystals in the initial time interval. This relaxation is tentatively attributed to a viscous flow of Abrikosov vortices at currents above the critical current. This relaxation gives way to a logarithmic relaxation upon the transition to thermally activated flux creep. The field dependence of the logarithmic relaxation rate has been studied in detail at various temperatures. A sharp change of the magnetic moment for the H perpendicular-to c direction has been observed.