FIG. 3. Experimentally observed behavior of a superconductor in a magnetic field. (a)-(b) With no applied magnetic field, the sample is cooled to below its transition temperature Tc. The sample becomes resistanceless. (c) The cooled sample is able to expel an applied magnetic field Ba that is less than Hc(T) in magnitude. (d) When the applied magnetic field Ba is removed, the sample has no residual magnetization. (e) With a magnetic field Ba applied, the sample is cooled to below its transition temperature Tc. (f) Below its transition temperature, the superconductor expels the applied magnetic field from its interior. (g) When the applied magnetic field Ba is removed, the sample has no residual magnetization.5
To Fig. 4

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