Global ETD Search
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Showing 1 to 18 of 18 for “"Type-II Superconductors"”.
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New evidence for flux cutting in type II superconductors.
… flow and cutting of nonparallel flux lines in type II superconductors. A dramatic reversal is observed in the evolution of $B\sb{z}\sb{hole}$, the axial flux density in the cavity of a hollow cylinder when the magnitude of a helical magnetic field, $\vec H\sb{ext} = \\phi H\sb\phi + \ z …
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Dynamics of Driven Vortices in Disordered Type-II Superconductors
… of driven magnetic flux vortices in disordered type-II superconductors for a variety of temperatures, types of disorder and sample thicknesses. We do so with the aid of Langevin molecular dynamics simulations of a coarsegrained elastic line model of flux vortices in the extreme London limit. …
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On numerical methods for diffusion of electric fields in type-II superconductors
… study of the diffusion of the electric field in type-II superconductors in low-frequency electromagnetism. The necessity for accurate numerical methods in this research domain is increasing along with the growing number and importance of industrial applications of type-II superconductors. In …
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Driven Magnetic Flux Lines in Type-II Superconductors: Nonequilibrium Steady States and Relaxation Properties
… steady state of driven magnetic flux lines in type-II superconductors subject to strong point or columnar pinning centers and the aging dynamics of nonequilibrium relaxation process in the presence of weak point pinning centers. We employ a three-dimensional elastic line model and Metropolis …
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Numerical Calculation of Losses of Trapped Vortices Under Strong RF Meissner Current and DC Superheating Field in Type II Superconductors
… dynamics and enhancing of superheating field in superconductors has attracted much attention in accelerator physics community to develop next-generation high-performance accelerator cavities. However, the extreme dynamics of curvilinear elastic vortices driven by very strong currents close to the …
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Non-Equilibrium Relaxation Dynamics in Disordered Superconductors and Semiconductors
… systems: magnetic vortex lines in disordered type-II superconductors and charge carriers in the Coulomb glass in disordered semiconductors. We utilize an elastic line model to simulate magnetic flux lines in disordered type-II superconductors by performing Langevin molecular dynamics …
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Approach to equilibrium in systems with continuous symmetries
… of the normal-superconductor interface for type I superconductors indicates the presence of an instability, analogous to that responsible for dendritic patterns in solidification. A simple mean-field picture of the transition kinetics of type II superconductors suggests the existence of two …
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On the Relaxation Dynamics of Disordered Systems
… elastic line model to simulate vortex lines in type-II superconductors. We study the effects of intrinsic demographic variability with inheritance in the reaction rates of the Lotka-Volterra model via zero-dimensional Monte Carlo simulations as well as two-dimensional lattice simulations. …
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Optimization of superconducting magnetic bearings using finite element modeling
… the rotors inside electric drives via the Meiissner effect, whereby superconductors tend to repel magnetic flux. The Finite Element Method was used to model superconducting bearings and optimize their dimensions. Computer simulations were written to simulate the superconducting state as well …
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Nonequilibrium Relaxation and Aging Scaling Properties of the Coulomb Glass and Bose Glass
… as well as the Bose glass phase of flux lines in type-II superconductors. We find a very fast forming gap in the density of states and explore the dependence of temperature and filling fraction. By studying two scaling methods, we find that the nonequilibrium relaxation properties can be described …
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A Study of Inhomogeneities and Anisotrophies In Superconductors via Ginzburg-Landau Type models
… a challenging area of scientific inquiry. Most superconductors of practical utility are of type-II, i.e., they allow the penetration of magnetic fields in the form of tubes of flux that are referred to as "vortices." Motion of these vortices due to, e.g., applied currents, induce a loss of …
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Approach to equilibrium in systems with continuous symmetries
… of the normal-superconductor interface for type I superconductors is presented. The presence of an instability analogous to that responsible for dendritic patterns in solidification is pointed out. Numerical simulations of the phase propagation in type I superconductors confirm the …
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Advanced Numerical Modelling of Bulk Superconductor Magnetisation
… volume, below a certain (critical) temperature. Superconductors can be subdivided into two classifications; type-I, or type-II, with the latter exhibiting a ‘mixed-state’ of superconductivity across their volume. Through appropriate magnetisation, magnetic flux may become ‘pinned’ within type-II …
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A finite element analysis of high kappa, high field Ginzburg-Landau type model of superconductivity
… and analysis of a simplified GinzburgLandau type model of superconductivity which is valid for large K and large magnetic field strengths. This model, referred to as the High kappa model, is derived via formal asymptotic expansion of the full, time-dependent Ginzburg-Landau equations. The …
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A study of holographic superconductors
… is investigated more extensively for s-wave superconductors. We consider a gravitational theory with a black hole solution in anti de Sitter spacetime, coupled to an Abelian-Higgs system in (d + 1)-dimensions. A wide range of negative mass squared for the scalar field that satisfied the …
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The doping and magnetic field dependence of the heat capacity of yttrium barium copper oxide superconductors
… contrast to what is observed in conventional superconductors when impurities are introduced. In order to make quantitative comparisons with various models and experiments, the heat capacity has been mathematically fit taking into account the effects of fluctuations and finite-size scaling. The …
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Imaging vortex dynamics in Josephson arrays using magnetic force microscopy
… role in determining the transport properties of type-II superconductors[1–3], and enable a platform to investigate exotic superconducting physics[4,5]. The study of vortex matter has generally focused on novel states in 2D films and structures, and has recently moved to investigating systems with …