Meissner effect

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The Meissner effect demonstrated by levitating a magnet above a cuprate superconductor, which is cooled by liquid nitrogen

The Meissner effect is the expulsion of a magnetic field from a superconductor during its transition to the superconducting state. The Meissner effect is shown by a magnet levitating above a plate cooled by liquid nitrogen. The magnetic field has moved up to be above the metal below.

The effect was discovered by Walter Meissner and Robert Ochsenfeld in 1933.