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{{About|the physical concept|philosophical concepts|Fluxon (philosophy)}} | |||
In [[physics]], a '''fluxon''' is a [[quantum]] of [[flux|electromagnetic flux]]. The term may have any of several related meanings. | |||
==Superconductivity== | |||
In the context of [[superconductivity]], especially related to [[type II superconductor]], a fluxon (aka [[Abrikosov vortex]]) is a small whisker of normal phase surrounded by superconducting phase. [[Supercurrent]]s circulate around its center. The magnetic field through such a whisker and its neighborhood, which has size of the order of London penetration depth <math>\lambda_L</math> (~100 nm), is quantized because of the phase properties of the [[magnetic potential|magnetic]] [[vector potential]] in [[quantum electrodynamics]], see [[magnetic flux quantum]] for details. | |||
In the context of [[long Josephson junction]]s, a '''fluxon''' (aka [[Josephson vortex]]) is made of circulating [[supercurrent]]s and has ''no'' normal core. Supercurrents circulate just around the mathematical center of a fluxon, which is situated with the (insulating) Josephson barrier. Again, the magnetic flux created by circulating [[supercurrent]]s is equal to a [[magnetic flux quantum]] <math>\Phi_0</math> (or a bit less if the superconducting electrodes of the Josephson junction are thinner than <math>\lambda_L</math>). | |||
==Magnetohydrodynamics modeling== | |||
In the context of numerical [[magnetohydrodynamics|MHD]] modeling, a fluxon is a discretized magnetic field line, representing a finite amount of magnetic flux in a localized bundle in the model. Fluxon models are explicitly designed to preserve the [[topology]] of the magnetic field, overcoming [[numerical resistivity]] effects in [[Lagrangian and Eulerian coordinates|Eulerian models]]. | |||
==References== | |||
{{Reflist}} | |||
==External links== | |||
* [http://flux.boulder.swri.edu FLUX], a fluxon-based MHD simulator | |||
[[Category:Theoretical physics]] | |||
[[Category:Superconductivity]] | |||
[[Category:Josephson_effect]] | |||
Revision as of 00:18, 20 August 2013
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In physics, a fluxon is a quantum of electromagnetic flux. The term may have any of several related meanings.
Superconductivity
In the context of superconductivity, especially related to type II superconductor, a fluxon (aka Abrikosov vortex) is a small whisker of normal phase surrounded by superconducting phase. Supercurrents circulate around its center. The magnetic field through such a whisker and its neighborhood, which has size of the order of London penetration depth (~100 nm), is quantized because of the phase properties of the magnetic vector potential in quantum electrodynamics, see magnetic flux quantum for details.
In the context of long Josephson junctions, a fluxon (aka Josephson vortex) is made of circulating supercurrents and has no normal core. Supercurrents circulate just around the mathematical center of a fluxon, which is situated with the (insulating) Josephson barrier. Again, the magnetic flux created by circulating supercurrents is equal to a magnetic flux quantum (or a bit less if the superconducting electrodes of the Josephson junction are thinner than ).
Magnetohydrodynamics modeling
In the context of numerical MHD modeling, a fluxon is a discretized magnetic field line, representing a finite amount of magnetic flux in a localized bundle in the model. Fluxon models are explicitly designed to preserve the topology of the magnetic field, overcoming numerical resistivity effects in Eulerian models.
References
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External links
- FLUX, a fluxon-based MHD simulator