The Meissner Effect
Image by Argonne National Laboratory
The Meissner effect is the expulsion of a magnetic field from a superconductor during its transition to the superconducting state. Walther Meissner and Robert Ochsenfeld discovered the phenomenon in 1933 by measuring the magnetic field distribution outside superconducting tin and lead samples.
Photo by Joseph W. Paulini / Argonne National Laboratory.