Meissner effect.

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When a metal becomes superconductor, its thermal conductivity decreases considerably and tends to zero approximately as the cube of the temperature.Superconducting state being a distinct phase of matter having characteristic electrical, magnetic, thermodynamic and other physical properties.Superconductors have zero electrical resistance.In a superconducting state the magnetic permeability is also zero and shows perfect diamagnetism.This phenomenon is known as Meissner effect.

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