superdiamagnetism
Sign in to saveAlso known as perfect diamagnetism
thumb|right|A superconductor acts as an essentially perfect diamagnetic material when placed in a magnetic field and it excludes the field, and so the flux lines completely avoid the region
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thumb|right|A superconductor acts as an essentially perfect diamagnetic material when placed in a magnetic field and it excludes the field, and so the flux lines completely avoid the region
Superdiamagnetism (or perfect diamagnetism) is a phenomenon occurring in certain materials at low temperatures, characterised by the complete absence of magnetic permeability (i.e. a volume magnetic susceptibility \chi_{\rm V} = −1) and the exclusion of the interior magnetic field.
Excerpted from Wikipedia’s “superdiamagnetism” article, available under the CC BY-SA 4.0 licence.