Depinning and nonequilibrium dynamic phases of particle assemblies driven over random and ordered substrates: a review

Reichhardt, C.

doi:10.1088/1361-6633/80/2/026501

Cited by 265 publications

(384 citation statements)

References 379 publications

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“…Additionally, these results will help in designing materials for superconducting devices, wires, and magnets, and could provide insight on open questions in other systems in which topological excitations undergo depinning processes, e.g., skyrmions in magnetic films 40 .…”

Section: S(t) Data From Ybco Samples With Different Microstructures (mentioning

confidence: 97%

Universal lower limit on vortex creep in superconductors

et al. 2017

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The search for a universal description of vortex matter -one that is applicable to a range of systems and regimes -is a formidable challenge, complicated by the complexity of the interactions between vortices and the environment. Vortex motion that can be induced by Magnus and Lorentz forces or thermal activation can also be counteracted by pinning forces. Because vortex cores are normal (i.e., superfluidity or superconductivity is destroyed inside them), creating a vortex costs energy, and pinning can occur when it is energetically more favorable for a vortex to appear in one location than in another. In type-II superconductors at high enough magnetic fields, vortices are formed by the penetration of magnetic flux, and material disorder that locally reduces the vortex core energy can produce pinning forces that almost completely preclude vortex motion. This results in nearly zero resistance, as long as the current density (J) does not exceed the critical current density (Jc). The caveat is that, for J

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Section: S(t) Data From Ybco Samples With Different Microstructures (mentioning

confidence: 97%

Universal lower limit on vortex creep in superconductors

et al. 2017

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“…Here, the choice of β as the symbol for the exponent is in accordance with Reference [70]. The power law equation given by Equation (17) is plotted as pink lines in Figure 3b.…”

Section: Kinetic Rougheningmentioning

confidence: 99%

Disassembly of Faceted Macrosteps in the Step Droplet Zone in Non-Equilibrium Steady State

Akutsu¹

2017

Crystals

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A Wulff figure-the polar graph of the surface tension of a crystal-with a discontinuity was calculated by applying the density matrix renormalization group method to the p-RSOS model, a restricted solid-on-solid model with a point-contact-type step-step attraction. In the step droplet zone in this model, the surface tension is discontinuous around the (111) surface and continuous around the (001) surface. The vicinal surface of 4H-SiC crystal in a Si-Cr-C solution is thought to be in the step droplet zone. The dependence of the vicinal surface growth rate and the macrostep size n on the driving force ∆µ for a typical state in the step droplet zone in non-equilibrium steady state was calculated using the Monte Carlo method. In contrast to the known step bunching phenomenon, the size of the macrostep was found to decrease with increasing driving force. The detachment of elementary steps from a macrostep was investigated, and it was found that n satisfies a scaling function. Moreover, kinetic roughening was observed for |∆µ| > ∆µ R , where ∆µ R is the crossover driving force above which the macrostep disappears.

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“…Periodic elastic medium of vortices in type II superconductors driven through a random pinning environment, is a powerful prototype for studying non-equilibrium (NE) systems 1–3 . The vortex number density, (and hence inter-vortex spacing ) is conveniently and continuously varied by changing the magnetic field ( B ), φ 0 is the magnetic flux quanta carried by each vortex.…”

Section: Introductionmentioning

confidence: 99%

Negative velocity fluctuations and non-equilibrium fluctuation relation for a driven high critical current vortex state

Bag

Shaw

Banerjee

et al. 2017

Sci Rep

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Under the influence of a constant drive the moving vortex state in 2H-NbS2 superconductor exhibits a negative differential resistance (NDR) transition from a steady flow to an immobile state. This state possesses a high depinning current threshold () with unconventional depinning characteristics. At currents well above , the moving vortex state exhibits a multimodal velocity distribution which is characteristic of vortex flow instabilities in the NDR regime. However at lower currents which are just above , the velocity distribution is non-Gaussian with a tail extending to significant negative velocity values. These unusual negative velocity events correspond to vortices drifting opposite to the driving force direction. We show that this distribution obeys the Gallavotti-Cohen Non-Equilibrium Fluctuation Relation (GC-NEFR). Just above , we also find a high vortex density fluctuating driven state not obeying the conventional GC-NEFR. The GC-NEFR analysis provides a measure of an effective energy scale (E eff) associated with the driven vortex state. The E eff corresponds to the average energy dissipated by the fluctuating vortex state above . We propose the high E eff value corresponds to the onset of high energy dynamic instabilities in this driven vortex state just above .

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Depinning and nonequilibrium dynamic phases of particle assemblies driven over random and ordered substrates: a review

Cited by 265 publications

References 379 publications

Universal lower limit on vortex creep in superconductors

Universal lower limit on vortex creep in superconductors

Disassembly of Faceted Macrosteps in the Step Droplet Zone in Non-Equilibrium Steady State

Negative velocity fluctuations and non-equilibrium fluctuation relation for a driven high critical current vortex state

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