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High density direct currents (DC) are used to drive flux quanta via theLorentz force towards a highly ordered "free flux flow" (FFF) dynamic state,made possible by the weak-pinning environment of high-quality, single-crystalsamples of two low-Tc superconducting compounds, V3Si and LuNi2B2C. We reportthe effect of the magnetic field-dependent fluxon core size on flux flowresistivity rho_f. Much progress has been made in minimizing the technicalchallenges associated with the use of high currents. Attainment of a FFF phaseis indicated by the saturation at highest currents of flux-flow dissipationlevels that are well below the normal state resistance and have field-dependentvalues. The field dependence of the corresponding rho_f is shown to beconsistent with a prediction based on a model for the decrease of flux coresize at higher fields in weak-coupling BCS s-wave materials.

Flux quanta driven by high-density currents in low-impurity V3Si and LuNi2B2C: free flux flow and flux-core size effect