Moving vortex crystal induced by commensurability effects in a superconductor with periodic pinning array

Zhu, Bei; Liu, M.; Xing, D. Y.; Zhao, Zhongxian

doi:10.1016/s0921-4534(01)00295-7

Cited by 5 publications

(1 citation statement)

References 21 publications

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“…The dynamic behavior of vortices in type-IIsuperconductors has been extensively studied both in experiment 1,2,3,4,5,6 and simulation. The simulations usually fall in one of two categories: Ginzburg-Landau-Theory 7,8,9,10,11,12,13 or a 2D-molecular dynamics model 14,15,16,17 . The former is used to determine details of the vortex configuration, usually for a small area of the sample, from first principles.…”

Section: Introductionmentioning

confidence: 99%

A versatile simulation of slow moving vortex lattices

Dreyer,

Lee,

Wang

et al. 2009

Preprint

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We designed and implemented our own versatile simulation software in order to understand the velocity changes and track patterns observed in slow moving vortex lattices. The data was obtained from time series of STM images on NbSe2 in a magnetic field range of 250−750 mT. The main thrust is to explore possible driving mechanism and to test the effect of various defect configuration on vortex velocity and tracks. The simulation uses the full vortex-vortex and vortex-defect interaction. It allows for periodic boundary conditions as well as a repulsive sample edge. In early versions the time intervals for recalculating the force were estimated for individual vortices. This, however, led to a positional 'noise' of unacceptable temperature of the vortex lattice and was hence replaced by a global time step control. We were able to produce similar track and velocity patterns as well as local lattice distortions near point defects as observed by STM. A detailed analysis is, however, beyond the scope of this paper.

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Section: Introductionmentioning

confidence: 99%

A versatile simulation of slow moving vortex lattices

Dreyer,

Lee,

Wang

et al. 2009

Preprint

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Surface Effects on the Dynamic Behavior of Vortices in Type II Superconducting Strips with Periodic and Conformal Pinning Arrays

Vizarim

Carlone

Verga

et al. 2017

J Supercond Nov Magn

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Using molecular dynamics techniques, we simulate the vortex behavior in a type II superconducting strip in the presence of triangular and two types of conformal pinning arrays, one with a pinning gradient perpendicular to the driving force (C1) and the other parallel (C2), at zero temperature. A transport force is applied in the infinite direction of the strip, and the magnetic field is increased until the rate between the density of vortices (n v ) and pinning (n p ) reaches n v /n p = 1.5. Our results show a monotonic increase, by steps, of the vortex density with the applied magnetic field. Besides, each pinning lattice presents a different vortex penetration delay. For the triangular pinning array, different than the case of infinite films, here the system exhibits only one pronounced depinning force peak at n v /n p = 1. However, the depinning force peak is present for only one value of field, in the range of fields where n v /n p = 1 is stable. For the case of conformal pinning arrays, in analogy to what is observed in infinite films, no commensurability depinning force peaks were found. In the present case, the C1 array is more efficient at low fields, all arrays are equivalent in the intermediate fields, and the C2 array is more efficient for high fields. We also show that for the C1 array at high fields, vortices depin following the conformal arches, from the edge to the center. For the C2 array, the depinning force is higher when compared to that of C1, because this particular conformal structure prevents the formation of easy vortex flow channels.

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