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Vortices in High Tc-Superconductors
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Magnetic flux can penetrate type-II superconductors in the form of vortices, which contain one quantum flux. A vortex is normal conducting in the core and surrounded by screening currents. The magnetic field associated with a vortex can be detected by MFM.
In the MFM above image taken at 5.2 K vortices have been produced by field cooling of a BSCCO single crystal in an external field of 2 mT. They are imaged as bright spots. The flux is trapped in the superconductor at pinning sites. The radius of the vortices is in the order of the London penetration depth.
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