Driving-force induced disappearance of the second magnetisation peak in Bi2Sr2CaCu2O8+δ single crystals at low temperatures

The puzzling disappearance of the second magnetisation peak below a certain temperature T0 in the case of Bi2Sr2CaCu2O8+δ single crystals is explained by considering the dynamic ordering of the vortex system caused by the current induced in the sample during standard magnetisation measurements. Another ingredient is the limitation of the second magnetisation peak to field values lower than the characteristic field B0 for the 3D-quasi-2D dimensional crossover. It was found that due to the inherent increase of the inborn driving force with decreasing T the dynamic response of the vortex system for T≤T0 is elastic on both sides of the limiting field B0. Consequently, there will be no jump in the current-voltage characteristics across B0 and the second magnetisation peak disappears