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Self-field imaging of current distribution in Ba0.6K0.4Fe2As2 superconductoris used to study the effect of drive on the low-field vortex solid to liquidmelting phase transformation. At low fields, the current induced drive on thevortices aids in thermally destabilizing the vortex state thereby shifting thelow field melting phase boundary. We show that the current induced drive shiftssolid-liquid boundaries and prepones the vortex melting phenomenon compared tothe equilibrium situation. The analysis shows that for currents above 50 mA,Joule heating effects shift the melting line while below 50 mA, an effectivetemperature concept for driven system viz., a drive dependent shakingtemperature, explains the shift. The observation of a transformation frominhomogeneous to homogeneous current flow in the sample at low fields as afunction of the driving force is reconciled via an inverse dependence of theshaking temperature on vortex velocity, which is incorporated in our analysis.

Imaging the effect of drive on the low-field vortex melting phenomenon in Ba0.6K0.4Fe2As2 single crystal