Transition from columnar to point pinning in coated conductors: critical currents that are independent of magnetic field direction

We identify a sharp crossover in the vortex pinning of a high-temperature superconductor with nanocolumnar stacks of precipitates as strong vortex pinning centers. Above a particular, temperature-dependent field BX(T) the vortex response is no longer determined by the nanocolumns, and is instead det...

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Veröffentlicht in:Superconductor science & technology 2012-07, Vol.25 (7), p.75009-1-5
Hauptverfasser: Zuev, Yuri L, Hun Wee, Sung, Christen, David K
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creator Zuev, Yuri L
Hun Wee, Sung
Christen, David K
description We identify a sharp crossover in the vortex pinning of a high-temperature superconductor with nanocolumnar stacks of precipitates as strong vortex pinning centers. Above a particular, temperature-dependent field BX(T) the vortex response is no longer determined by the nanocolumns, and is instead determined by point-like pinning. This crossover is evident as a change in the dependence of the critical current density on the angle between the applied magnetic field and the nanocolumns. It also leads to the field-orientation-independent power law index n of the E-J curves. Below the transition, there is a strong maximum in JC when the field is aligned parallel to the columns and n depends on field direction. Above the transition, n is independent of the field direction and there is a JC minimum for H parallel to the columns. We discuss a possible mechanism for such behavior change, as well as testing and confirming a prediction that the crossover must become very broad at high temperatures and low fields.
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subjects Condensed matter: electronic structure, electrical, magnetic, and optical properties
Critical currents
Crossovers
Cuprates superconductors (high tc and insulating parent compounds)
Exact sciences and technology
Fluid flow
Magnetic fields
Nanocomposites
Nanomaterials
Nanostructure
Physics
Pinning
Properties of type I and type II superconductors
Superconductivity
Transport properties (electric and thermal conductivity, thermoelectric effects, etc.)
Vortex lattices ,flux pinning, flux creep
Vortices
title Transition from columnar to point pinning in coated conductors: critical currents that are independent of magnetic field direction
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