What is the Meissner Effect ?Meissner Effect DefinitionThe Meissner effect is defined as the expulsion of magnetic fields from a superconductor when it is cooled below its critical temperature.Discovery and ExperimentGerman physicists Walther Meissner and Robert Ochsenfeld discovered the Meissner effect in 1933 through experiments with tin and lead samples.Meissner StateThe Meissner state occurs when a superconductor expels external magnetic fields, creating a state with zero magnetic field insi