Vortex Washboard Voltage Noise in Type-II Superconductors

Abstract

In order to characterize flux flow through disordered type-II superconductors, we investigate the effects of columnar and point defects on the vortex velocity / voltage power spectrum in the driven non-equilibrium steady state. We employ three-dimensional Metropolis Monte Carlo simulations to measure relevant physical observables including the force-velocity / current-voltage (I-V) characteristics, vortex spatial arrangement and structure factor, and mean flux line radius of gyration. Our simulation results compare well to earlier findings and physical intuition. We focus specifically on the voltage noise power spectra in conjunction with the vortex structure factor in the presence of weak columnar and point pinning centers. We investigate the vortex washboard noise peak and associated higher harmonics, and show that the intensity ratios of the washboard harmonics are determined by the strength of the material defects rather than the type of pins present. Through varying columnar defect lengths and pinning strengths as well as magnetic flux density we further explore the effect of the material defects on vortex transport. It is demonstrated that the radius of gyration displays quantitatively unique features that depend characteristically on the type of material defects present in the sample.

arXiv commentLatex, 17 pages, 14 figures

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• Relaxation and Glassy Dynamics in Disordered Type-II Superconductors
• Relaxation dynamics in type-II superconductors with point-like and correlated disorder
• Relaxation dynamics of vortex lines in disordered type-II superconductors following magnetic field and temperature quenches
• Disordered vortex matter out of equilibrium: a Langevin molecular dynamics study
• Characterization of relaxation processes in interacting vortex matter through a time-dependent correlation length
• Collective depinning and sliding of a quantum Wigner solid in a 2D electron system
• Noise and Thermal Depinning of Wigner Crystals
• Nonequilibrium steady states of driven magnetic flux lines in disordered type-II superconductors
• Flux line relaxation kinetics following current quenches in disordered type-II superconductors
• Dynamical regimes of vortex flow in type-II superconductors with parallel twin boundaries
• Fluctuations and Pinning for Individually Manipulated Skyrmions
• Quantum Wigner solid in two-dimensional electron systems in semiconductors