The study focused on the phase transition of vortices induced by current flow in untwinned YBa 2 Cu 3 O 7 - delta single crystals. Near the first-order melting transition line, changes in electrical resistivity, hysteresis behavior, and voltage-current characteristics were observed, indicating the current-induced melting of the vortex lattice.
To study the phase transition of vortices induced by current flow, the electrical resistivity and the voltage-current characteristic have been measured on untwinned YBa 2 Cu 3 O 7 - delta single crystals in a magnetic field parallel to the c axis. Near a first-order melting transition (FOMT) line, the well-known counterclockwise hysteresis of resistivity drop disappears completely above a certain current density while a novel clockwise hysteresis appears just below this resistivity drop. Moreover, the voltage-current characteristic does not show any Ohmic behavior as the current increases near the FOMT line. The obtained results are explained by the current-induced melting of the vortex lattice or smectic similar to an increase in the temperature or the magnetic field.
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