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Dynamic ordering of driven vortex matter has been investigated in the peakeffect regime of both amorphous MoGe films and 2H-NbSe2 crystals by modelocking (ML) and dc transport measurements. ML features allow us to trace howthe shear rigidity of driven vortices evolves with the average velocity.Determining the onset of ML resonance in different magnetic fields and/ortemperatures, we find that the dynamic ordering frequency (velocity) exhibits astriking divergence in the higher part of the peak effect regime.Interestingly, this phenomenon is accompanied by a pronounced peak of dynamiccritical current. Mapping out field-temperature phase diagrams, we find thatdivergent points follow well the thermodynamic melting curve of the idealvortex lattice over wide field and/or temperature ranges. These findingsprovide a link between the dynamic and static melting phenomena which can bedistinguished from the disorder induced peak effect.

Dynamic ordering of driven vortex matter in the peak effect regime of amorphous MoGe films and 2H-NbSe2 crystals