Jamming, Fragility and Pinning Phenomena in Superconducting Vortex Systems
arXiv:2004.01268 · doi:10.1038/s41598-020-68417-0
Abstract
We examine driven superconducting vortices interacting with quenched disorder where we measure the memory effects under a sequence of drive pulses applied perpendicular to each other. As a function of disorder strength, we find four types of behavior: an elastic response, a fragile phase, a jammed phase, and a pinning dominated regime. These phases can be distinguished by the presence or absence of different types of memory effects. The fragile and jammed states exhibit memory, while the elastic and pinning dominated regimes do not. In the fragile regime, the system organizes into a pinned state during the first drive pulse, flows during the second drive pulse which is applied in the perpendicular direction, and then returns to a pinned state during the third drive pulse which is applied in the same direction as the first pulse. This behavior is the hallmark of fragility that has been proposed for jamming in particulate matter by Cates et al. [Phys. Rev. Lett. 81, 1841 (1998)]. For stronger disorder, we observe a robust jamming state in which a memory effect is still present but the system reaches a pinned or reduced flow state during the perpendicular drive pulse, similar to what appears in granular systems under shear jamming. We show that the different states produce signatures in the spatial vortex configurations, with memory effects arising from the coexistence of an elastic component and a pinned component in the vortex assembly. The sequential perpendicular driving protocol we propose for distinguishing fragile, jammed, and pinned phases should be general to the broader class of driven interacting particles in the presence of quenched disorder.
arXiv comment9 pages, 8 figures
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