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Using micro-bridge technique, we have studied the vortex dynamics in a verylow temperature region (i.e. T/Tc -> 0) of the B-T phase diagram ofBi_2Sr_2Ca_1Cu_2O_{8+\delta} single crystal. We distinguish two types of vortexdynamics near the depinning threshold depending on the magnitude of thevortex-vortex interactions. For 0.01 <= \mu_0H <= 1T, we show thatcurrent-voltage characteristics (I-V) are strongly dependent on the history ofmagnetic field and current cycling. The sharp peak, so called "peak effect"(PE), observed in \mu_0H-Ic curve is due to a metastable state which can beremoved after current cycling. At low field, I-V curves exhibit steps whichclearly enligth a "fingerprint phenomenon" as it can be seen the currentdependence of the differential resistance Rd = dV/dI. We associate this tovortices flow through uncorrelated channels for the highly defective lattice.Indeed, as field sufficiently increase, these peaks merge giving broader onesindicating a crossover from filamentaty strings to braid river like in whichvortex-vortex interactions becomes significant. As confirmed by thediscontinuity in the critical exponent value \beta determined in the vicinityof the threshold current using the power-law scaling V (I-Ic)^\beta with acrossover from \beta = 2.2 to \beta = 1.2. The strong vortex correlation alongthe c-axis has been clearly demonstrated using the dc-flux-transformer geometryfor transport measurements which confirms the pseudo-2D behaviour of the FLL.Our transport studies are in good agreement with recent simulations results of2D elastic objects driven by repulsive interactions through a random pinningpotential.

Filamentary flow of vortices with infinite tilt modulus in Bi_2Sr_2Ca_1Cu_2O_{8+\delta} single crystal