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

Abstract

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.

arXiv comment9 pages, 6 figures

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Cited by in corpus (6)

• The Ginzburg-Landau Theory of Type II superconductors in magnetic field
• Imaging superconducting vortex core and lattice with the scanning tunneling microscope
• Magnetic field induced 3D to 1D crossover in type II superconductors
• Peak effect in a superconductor/normal metal strip being in vortex-free state
• Nonpertubative Many-Body Theory for the Two-Dimensional Hubbard Model at Low Temperature: From Weak to Strong Coupling Regimes
• Anisotropic response of the moving vortex lattice in superconducting Mo${}_{(1-x)}$Ge${}_x$ amorphous films