Characterization of relaxation processes in interacting vortex matter through a time-dependent correlation length

Pleimling, Michel; Täuber, Uwe C.

doi:10.1088/1742-5468/2015/09/p09010

Cited by 8 publications

(9 citation statements)

References 42 publications

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“…The scaling only emerges for larger t/s, when the system has had sufficient time to overcome the initial large fluctuations that immediately follow the quench, and to enter the aging scaling regime. For interacting lines, the aging scaling regime will be cut short at very long times by the caging effect of the repulsive vortex interactions (also responsible for limiting the growth of r g ) [29]. The scaling form for simple aging given in (10) is a special case of the more general scaling form f C (t, s) ∼ [L(t)/L(s)] −λ C .…”

Section: Quenches From the Moving Into The Pinned Regimementioning

confidence: 99%

Flux line relaxation kinetics following current quenches in disordered type-II superconductors

Chaturvedi¹,

Assi²,

Dobramysl³

et al. 2016

J. Stat. Mech.

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We investigate the relaxation dynamics of magnetic vortex lines in type-II superconductors following rapid changes of the external driving current by means of an elastic line model simulated with Langevin molecular dynamics. A system of flux vortices in a sample with randomly distributed point-like defects is subjected to an external current of appropriate strength for a sufficient period of time so as to be in a moving non-equilibrium steady state. The current is then instantaneously lowered to a value that pertains to either the moving or pinned regime. The ensuing relaxation of the flux lines is studied via one-time observables such as their mean velocity and radius of gyration. We have in addition measured the two-time flux line height autocorrelation function to investigate dynamical scaling and aging behavior in the system, which in particular emerge after quenches into the glassy pinned state.

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Section: Quenches From the Moving Into The Pinned Regimementioning

confidence: 99%

Flux line relaxation kinetics following current quenches in disordered type-II superconductors

Chaturvedi¹,

Assi²,

Dobramysl³

et al. 2016

J. Stat. Mech.

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“…For the case of random point defects, which is the only case considered in this paper, these pinning centers are randomly distributed and chosen independently for each layer. If one were to instead consider columnar defects aligned parallel to the magnetic field along the z direction, then one would repeat the same spatial distribution pattern for each layer [6,14,16].…”

Section: Implementation For Disordered Type-ii Superconductorsmentioning

confidence: 99%

Disordered vortex matter out of equilibrium: a Langevin molecular dynamics study

Assi

Chaturvedi

Dobramysl

et al. 2016

Molecular Simulation

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We discuss the use of Langevin molecular dynamics in the investigation of the non-equilibrium properties of disordered vortex matter. Our special focus is set on values of system parameters that are realistic for disordered high-Tc superconductors such as YBCO. Using a discretized elastic line model, we study different aspects of vortices far from thermal equilibrium. On the one hand we investigate steady-state properties of driven magnetic flux lines in a disordered environment, namely the current-voltage characteristics, the gyration radius, and the pinning time statistics. On the other hand we study the complex relaxation processes and glassy-like dynamics that emerge in type-II superconductors due to the intricate competition between the long-range vortex-vortex repulsion and flux pinning due to randomly placed point defects. To this end we consider different types of sudden perturbations: temperature, magnetic field, and external current quenches.

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“…Du et al observed that the voltage response to an externally applied current in a superconducting 2H-NbSe 2 sample depended on the pulse duration, and that was an evidence of the occurrence of physical aging in disordered superconducting materials [21]. On the numerical front, Pleimling and Täuber employed an elastic line model and Monte Carlo simulations to study magnetic flux lines in type-II superconductors analyzing their non-equilibrium relaxation properties, starting from somewhat artificial initial conditions where straight flux lines were randomly placed in the sample [22,23]. The resulting complex aging features (with identical initial conditions and parameter values) were subsequently confirmed in a very different microscopic representation of the non-equilibrium vortex kinetics through Langevin molecular dynamics [24].…”

Section: Introductionmentioning

confidence: 99%

Structural relaxation and aging scaling in the Coulomb and Bose glass models

et al. 2016

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Abstract. We employ Monte Carlo simulations to study the relaxation properties of the two-dimensional Coulomb glass in disordered semiconductors and the three-dimensional Bose glass in type-II superconductors in the presence of extended linear defects. We investigate the effects of adding non-zero random on-site energies from different distributions on the properties of the correlation-induced Coulomb gap in the density of states (DOS) and on the non-equilibrium aging kinetics highlighted by the density autocorrelation functions. We also probe the sensitivity of the system's equilibrium and non-equilibrium relaxation properties to instantaneous changes in the density of charge carriers in the Coulomb glass or flux lines in the Bose glass.

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Characterization of relaxation processes in interacting vortex matter through a time-dependent correlation length

Cited by 8 publications

References 42 publications

Flux line relaxation kinetics following current quenches in disordered type-II superconductors

Flux line relaxation kinetics following current quenches in disordered type-II superconductors

Disordered vortex matter out of equilibrium: a Langevin molecular dynamics study

Structural relaxation and aging scaling in the Coulomb and Bose glass models

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