Physics – Condensed Matter – Superconductivity
Scientific paper
2007-06-14
Phys. Rev. B 75, 184512 (2007)
Physics
Condensed Matter
Superconductivity
9 pages, 6 figures
Scientific paper
10.1103/PhysRevB.75.184512
Dynamic ordering of driven vortex matter has been investigated in the peak effect regime of both amorphous MoGe films and 2H-NbSe2 crystals by mode locking (ML) and dc transport measurements. ML features allow us to trace how the shear rigidity of driven vortices evolves with the average velocity. Determining the onset of ML resonance in different magnetic fields and/or temperatures, we find that the dynamic ordering frequency (velocity) exhibits a striking divergence in the higher part of the peak effect regime. Interestingly, this phenomenon is accompanied by a pronounced peak of dynamic critical current. Mapping out field-temperature phase diagrams, we find that divergent points follow well the thermodynamic melting curve of the ideal vortex lattice over wide field and/or temperature ranges. These findings provide a link between the dynamic and static melting phenomena which can be distinguished from the disorder induced peak effect.
Asada Tadashi
Kadowaki Kazuo
Kes Peter H.
Kokubo Nobuhito
Sorop 1 T. G.
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