london penetration depth वाक्य
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- For most superconductors, the London penetration depth is on the order of 100 nm.
- Near the surface, within the London penetration depth, the magnetic field is not completely cancelled.
- The ratio \ kappa = \ lambda / \ xi, where \ lambda is the London penetration depth, is known as the Ginzburg Landau parameter.
- I . e . that whilst magnetic flux is expelled from a superconductor, this happens exponentially over a finite length with an exponent which is now called the London penetration depth.
- The London penetration depth is one of the most important parameters characterizing a superconductor because its inverse square provides a measure of the density " n s " of Cooper pairs.
- More generally, a higher temperature and a stronger magnetic field lead to a smaller fraction of the electrons in the superconducting band and consequently a longer London penetration depth of external magnetic fields and currents.
- Where d _ I is the thickness of the Josephson barrier ( usually insulator ), d _ 1 and d _ 2 are the thicknesses of superconducting electrodes, and \ lambda _ 1 and \ lambda _ 2 are their London penetration depths.
- The ratio of the London penetration depth " ? " to the superconducting coherence length " ? " determines whether a superconductor is type-I or type-II . Type-I superconductors are those with 0 1 / " 2.
- When a superconductor is placed in a weak external magnetic field "'H "', the field penetrates the superconductor only a small distance " ? ", called the London penetration depth, decaying exponentially to zero within the interior of the material.
- There is also a correspondence between confinement in QCD the fact that the color field is only different from zero in the interior of hadrons and the behaviour of the usual magnetic field in the theory of type-II superconductors : there the magnetism is confined to the interiour of the Abrikosov flux-line lattice, i . e ., the London penetration depth " & lambda; " of that theory is analogous to the confinement radius " R c " of quantum chromodynamics.
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