Abstract
The driven vortex states in the various single crystals Bi2Sr2CaCu2O8+δ with different preparation conditions and electric contact geometry have been studied using in-plane resistivity measurements as functions of temperature, transport current density, magnetic field and its orientations. The vortex lattice melting transition was observed for the wide range of the driving forces in both orientations, H//c and titled to c-axis, sharply separating the vortex solid and liquid phases even in the nonequilibrium conditions. The nonlinear resistivity behavior was found even in the vortex liquid phase well above VLMT, indicating various sources of non-Ohmic behavior.
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