Peak effect and dynamic melting of vortex matter in NbSe${}_2$ crystals

Abstract

We present a mode locking (ML) phenomenon of vortex matter observed around the peak effect regime of 2H-NbSe${}_2$ pure single crystals. The ML features allow us not only to trace how the shear rigidity of driven vortices persists on approaching the second critical field, but also to demonstrate a dynamic melting transition of driven vortices at a given velocity. We observe the velocity dependent melting signatures in the peak effect regime, which reveal a crossover between the disorder-induced transition at small velocity and the thermally induced transition at large velocity. This uncovers the relationship between the peak effect and the thermal melting.

arXiv commentTo appear in Physical Review Letter

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• Shapiro Steps for Skyrmion Motion on a Washboard Potential with Longitudinal and Transverse ac Drives
• Dynamic ordering of driven vortex matter in the peak effect regime of amorphous MoGe films and 2H-NbSe2 crystals
• Giant low frequency velocity fluctuations in a driven vortex lattice
• Thermodynamic Observation of a Vortex Melting Transition in the Fe-based Superconductor Ba0.5K0.5Fe2As2
• Anomalous second magnetization peak in 12442-type RbCa${}_2$Fe${}_4$As${}_4$F${}_2$ superconductors
• Evolution in the split-peak structure across the Peak Effect region in single crystals of $2H$-NbSe${}_2$
• Vortex Phase Diagram of Layered Superconductor Cu0.03TaS2 for H || c
• Flow and Tilt-Induced Orientation of the Moving Vortex Lattice in Amorphous NbGe Superconducting Thin Films